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Vulnerability details: VCID-mhua-rw7n-n3fp
Vulnerability ID VCID-mhua-rw7n-n3fp
Aliases CVE-2021-40346
Summary insufficient validation
Status Published
Exploitability 2.0
Weighted Severity 6.8
Risk 10.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CWE-190 Integer Overflow or Wraparound
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-40346.json
epss 0.89437 https://api.first.org/data/v1/epss?cve=CVE-2021-40346
epss 0.89437 https://api.first.org/data/v1/epss?cve=CVE-2021-40346
epss 0.92924 https://api.first.org/data/v1/epss?cve=CVE-2021-40346
epss 0.92924 https://api.first.org/data/v1/epss?cve=CVE-2021-40346
epss 0.92924 https://api.first.org/data/v1/epss?cve=CVE-2021-40346
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-40346
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-40346
archlinux Medium https://security.archlinux.org/AVG-2343
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-40346.json
https://api.first.org/data/v1/epss?cve=CVE-2021-40346
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40346
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://git.haproxy.org/?p=haproxy.git
https://github.com/haproxy/haproxy/commit/3b69886f7dcc3cfb3d166309018e6cfec9ce2c95
https://jfrog.com/blog/critical-vulnerability-in-haproxy-cve-2021-40346-integer-overflow-enables-http-smuggling/
https://lists.apache.org/thread.html/r284567dd7523f5823e2ce995f787ccd37b1cc4108779c50a97c79120%40%3Cdev.cloudstack.apache.org%3E
https://lists.apache.org/thread.html/r8a58fd7a29808e5d27ee56877745e58dc4bb041b9af94601554e2a5a%40%3Cdev.cloudstack.apache.org%3E
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A7V2IYO22LWVBGUNZWVKNTMDV4KINLFO/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXTSBY2TEAXWZVFQM3CXHJFRONX7PEMN/
https://www.debian.org/security/2021/dsa-4968
https://www.mail-archive.com/haproxy%40formilux.org
https://www.mail-archive.com/haproxy%40formilux.org/msg41114.html
2000599 https://bugzilla.redhat.com/show_bug.cgi?id=2000599
AVG-2343 https://security.archlinux.org/AVG-2343
cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
cpe:2.3:a:haproxy:haproxy:2.5:dev0:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haproxy:haproxy:2.5:dev0:*:*:*:*:*:*
cpe:2.3:a:haproxy:haproxy:2.5:dev1:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haproxy:haproxy:2.5:dev1:*:*:*:*:*:*
cpe:2.3:a:haproxy:haproxy:2.5:dev2:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haproxy:haproxy:2.5:dev2:*:*:*:*:*:*
cpe:2.3:a:haproxy:haproxy:2.5:dev3:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haproxy:haproxy:2.5:dev3:*:*:*:*:*:*
cpe:2.3:a:haproxy:haproxy:2.5:dev4:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haproxy:haproxy:2.5:dev4:*:*:*:*:*:*
cpe:2.3:a:haproxy:haproxy:2.5:dev5:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haproxy:haproxy:2.5:dev5:*:*:*:*:*:*
cpe:2.3:a:haproxy:haproxy:2.5:dev6:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haproxy:haproxy:2.5:dev6:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
CVE-2021-40346 https://nvd.nist.gov/vuln/detail/CVE-2021-40346
RHSA-2021:4118 https://access.redhat.com/errata/RHSA-2021:4118
RHSA-2021:5208 https://access.redhat.com/errata/RHSA-2021:5208
RHSA-2022:0024 https://access.redhat.com/errata/RHSA-2022:0024
RHSA-2022:0114 https://access.redhat.com/errata/RHSA-2022:0114
USN-5063-1 https://usn.ubuntu.com/5063-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-40346.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:N/S:U/C:N/I:H/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: AV:N/AC:L/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-40346
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:N/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-40346
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 0.99517
EPSS Score 0.89437
Published At July 8, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T11:54:20.089019+00:00 Arch Linux Importer Import https://security.archlinux.org/AVG-2343 36.1.3