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Vulnerability details: VCID-guem-61xt-mycx
Vulnerability ID VCID-guem-61xt-mycx
Aliases CVE-2021-43797
GHSA-wx5j-54mm-rqqq
Summary Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty prior to version 4.1.71.Final skips control chars when they are present at the beginning / end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing to do the validation might cause netty to "sanitize" header names before it forward these to another remote system when used as proxy. This remote system can't see the invalid usage anymore, and therefore does not do the validation itself. Users should upgrade to version 4.1.71.Final.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 6.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43797.json
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
epss 0.00139 https://api.first.org/data/v1/epss?cve=CVE-2021-43797
cvssv3.1 6.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-wx5j-54mm-rqqq
cvssv3.1 6.5 https://github.com/netty/netty
generic_textual MODERATE https://github.com/netty/netty
cvssv3.1 6.5 https://github.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323
generic_textual MODERATE https://github.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323
cvssv3.1 6.5 https://github.com/netty/netty/pull/11891
generic_textual MODERATE https://github.com/netty/netty/pull/11891
cvssv3.1 6.5 https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq
cvssv3.1_qr MODERATE https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq
generic_textual MODERATE https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq
cvssv3.1 6.5 https://lists.debian.org/debian-lts-announce/2023/01/msg00008.html
generic_textual MODERATE https://lists.debian.org/debian-lts-announce/2023/01/msg00008.html
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-43797
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-43797
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-43797
cvssv3.1 6.5 https://security.netapp.com/advisory/ntap-20220107-0003
generic_textual MODERATE https://security.netapp.com/advisory/ntap-20220107-0003
cvssv3.1 6.5 https://www.debian.org/security/2023/dsa-5316
generic_textual MODERATE https://www.debian.org/security/2023/dsa-5316
cvssv3.1 6.5 https://www.oracle.com/security-alerts/cpuapr2022.html
generic_textual MODERATE https://www.oracle.com/security-alerts/cpuapr2022.html
cvssv3.1 6.5 https://www.oracle.com/security-alerts/cpujul2022.html
generic_textual MODERATE https://www.oracle.com/security-alerts/cpujul2022.html
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43797.json
https://api.first.org/data/v1/epss?cve=CVE-2021-43797
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37136
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37137
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43797
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41881
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41915
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/netty/netty
https://github.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323
https://github.com/netty/netty/pull/11891
https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq
https://lists.debian.org/debian-lts-announce/2023/01/msg00008.html
https://nvd.nist.gov/vuln/detail/CVE-2021-43797
https://security.netapp.com/advisory/ntap-20220107-0003
https://security.netapp.com/advisory/ntap-20220107-0003/
https://www.debian.org/security/2023/dsa-5316
https://www.oracle.com/security-alerts/cpuapr2022.html
https://www.oracle.com/security-alerts/cpujul2022.html
1001437 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1001437
2031958 https://bugzilla.redhat.com/show_bug.cgi?id=2031958
cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:*
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_deposits_and_lines_of_credit_servicing:2.7:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:banking_deposits_and_lines_of_credit_servicing:2.7:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_party_management:2.7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:banking_party_management:2.7.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_platform:2.6.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:banking_platform:2.6.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:coherence:12.2.1.4.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:coherence:12.2.1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:coherence:14.1.1.0.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:coherence:14.1.1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.11.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.11.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_slice_selection_function:1.8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_cloud_native_core_network_slice_selection_function:1.8.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.15.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.15.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_security_edge_protection_proxy:1.7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_cloud_native_core_security_edge_protection_proxy:1.7.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_unified_data_repository:1.15.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_cloud_native_core_unified_data_repository:1.15.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_design_studio:7.4.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_design_studio:7.4.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_instant_messaging_server:8.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_instant_messaging_server:8.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:helidon:1.4.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:helidon:1.4.10:*:*:*:*:*:*:*
cpe:2.3:a:oracle:helidon:2.4.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:helidon:2.4.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:*
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:*:*:*:*:*:*:*
cpe:2.3:a:quarkus:quarkus:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:quarkus:quarkus:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
GHSA-wx5j-54mm-rqqq https://github.com/advisories/GHSA-wx5j-54mm-rqqq
RHSA-2022:0520 https://access.redhat.com/errata/RHSA-2022:0520
RHSA-2022:1345 https://access.redhat.com/errata/RHSA-2022:1345
RHSA-2022:2216 https://access.redhat.com/errata/RHSA-2022:2216
RHSA-2022:2217 https://access.redhat.com/errata/RHSA-2022:2217
RHSA-2022:2218 https://access.redhat.com/errata/RHSA-2022:2218
RHSA-2022:4623 https://access.redhat.com/errata/RHSA-2022:4623
RHSA-2022:4918 https://access.redhat.com/errata/RHSA-2022:4918
RHSA-2022:4919 https://access.redhat.com/errata/RHSA-2022:4919
RHSA-2022:4922 https://access.redhat.com/errata/RHSA-2022:4922
RHSA-2022:5101 https://access.redhat.com/errata/RHSA-2022:5101
RHSA-2022:5498 https://access.redhat.com/errata/RHSA-2022:5498
RHSA-2022:5532 https://access.redhat.com/errata/RHSA-2022:5532
RHSA-2022:5903 https://access.redhat.com/errata/RHSA-2022:5903
RHSA-2022:6782 https://access.redhat.com/errata/RHSA-2022:6782
RHSA-2022:6783 https://access.redhat.com/errata/RHSA-2022:6783
RHSA-2022:6787 https://access.redhat.com/errata/RHSA-2022:6787
RHSA-2022:7409 https://access.redhat.com/errata/RHSA-2022:7409
RHSA-2022:7410 https://access.redhat.com/errata/RHSA-2022:7410
RHSA-2022:7411 https://access.redhat.com/errata/RHSA-2022:7411
RHSA-2022:7417 https://access.redhat.com/errata/RHSA-2022:7417
USN-6049-1 https://usn.ubuntu.com/6049-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43797.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://github.com/netty/netty
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://github.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://github.com/netty/netty/pull/11891
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://lists.debian.org/debian-lts-announce/2023/01/msg00008.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43797
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43797
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://security.netapp.com/advisory/ntap-20220107-0003
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://www.debian.org/security/2023/dsa-5316
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://www.oracle.com/security-alerts/cpuapr2022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://www.oracle.com/security-alerts/cpujul2022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.34848
EPSS Score 0.00139
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:12:16.998381+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/6049-1/ 36.1.3