CVE-2021-40346

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
mitreCNA
---
---
CVEADP
---
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 99%
VendorProductVersion
haproxyhaproxy
2.0.0 ≤
𝑥
< 2.0.25
haproxyhaproxy
2.2.0 ≤
𝑥
< 2.2.17
haproxyhaproxy
2.3.0 ≤
𝑥
< 2.3.14
haproxyhaproxy
2.4.0 ≤
𝑥
< 2.4.4
haproxyhaproxy
2.5:dev0
haproxyhaproxy
2.5:dev1
haproxyhaproxy
2.5:dev2
haproxyhaproxy
2.5:dev3
haproxyhaproxy
2.5:dev4
haproxyhaproxy
2.5:dev5
haproxyhaproxy
2.5:dev6
debiandebian_linux
11.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
haproxy
bullseye (security)
2.2.9-2+deb11u6
fixed
bullseye
2.2.9-2+deb11u6
fixed
buster
not-affected
stretch
not-affected
bookworm
2.6.12-1+deb12u1
fixed
bookworm (security)
2.6.12-1+deb12u1
fixed
sid
2.9.11-1
fixed
trixie
2.9.11-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
haproxy
jammy
Fixed 2.2.9-2ubuntu2
released
impish
Fixed 2.2.9-2ubuntu2
released
hirsute
Fixed 2.2.9-1ubuntu0.2
released
focal
Fixed 2.0.13-2ubuntu0.3
released
bionic
not-affected
xenial
not-affected
trusty
dne
References