CVE-2021-40346
HighPublic PoC
Published: 08 September 2021
Published
08 September 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS Score
0.9238
99.7th percentile
Risk Priority
70
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-40346 is a high-severity Integer Overflow or Wraparound (CWE-190) vulnerability in Haproxy Haproxy. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 0.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-27525
Vulnerability details
An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
haproxy
haproxy
2.5 · 2.0.0 — 2.0.25 · 2.2.0 — 2.2.17 · 2.3.0 — 2.3.14
debian
debian linux
11.0
fedoraproject
fedora
33, 34
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.