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Vulnerability details: VCID-y77q-dr57-aaae
Vulnerability ID VCID-y77q-dr57-aaae
Aliases CVE-2021-43826
Summary CVE-2021-43826 envoy: Use-after-free when tunneling TCP over HTTP
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
rhas Important https://access.redhat.com/errata/RHSA-2022:1275
rhas Important https://access.redhat.com/errata/RHSA-2022:1276
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43826.json
epss 0.00037 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00037 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00037 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00037 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00037 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00037 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00037 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00038 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00086 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
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epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.0009 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00092 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00132 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00132 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
epss 0.00132 https://api.first.org/data/v1/epss?cve=CVE-2021-43826
rhbs medium https://bugzilla.redhat.com/show_bug.cgi?id=2050748
cvssv3.1 7.5 https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145
ssvc Track https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145
cvssv3.1 7.5 https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf
ssvc Track https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-43826
cvssv3 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-43826
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-43826
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43826.json
https://api.first.org/data/v1/epss?cve=CVE-2021-43826
https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145
https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf
2050748 https://bugzilla.redhat.com/show_bug.cgi?id=2050748
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
CVE-2021-43826 https://nvd.nist.gov/vuln/detail/CVE-2021-43826
ISTIO-SECURITY-2022-003 https://istio.io/latest/news/security/ISTIO-SECURITY-2022-003/
RHSA-2022:1275 https://access.redhat.com/errata/RHSA-2022:1275
RHSA-2022:1276 https://access.redhat.com/errata/RHSA-2022:1276
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43826.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:N/A:H Found at https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145
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: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T15:57:19Z/ Found at https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf
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: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T15:57:19Z/ Found at https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43826
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:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43826
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:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43826
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 0.07657
EPSS Score 0.00037
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.