VDB
DEBIAN-CVE-2021-40346
DEBIAN-CVE-2021-40346
PUBLISHED
CVSS 7.5 HIGH
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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:12 | haproxy | 0, 0, 0 |
| Debian:11 | haproxy | 2.2.9-2, 2.2.9-2, 0 |
| Debian:14 | haproxy | 0, 0, 0 |
| Debian:13 | haproxy | 0, 0, 0 |
Exploit Intelligence
- HAProxy CVE-2021-40346 (github-poc-repo)
- HTTP Request Smuggling (github-poc-repo)
- HTTP Request Smuggling (github-poc)
- HAProxy CVE-2021-40346 (github-poc)
- alikarimi999/CVE-2021-40346 (github-poc)
- CVE-2021-40346 integer overflow enables http smuggling (github-poc)
- CVE-2021-40346 PoC (HAProxy HTTP Smuggling) (github-poc)
- writeups.html (github-poc)
- search.html (github-poc)
Timeline
- Sep 8, 2021 CVE Published
- Apr 28, 2026 CVE Updated