CVE-2021-40346
HIGH7.5EPSS 92.4%haproxy - security update
Published: 9/8/2021Modified: 4/28/2026
Description
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.
Affected packages (3)
- Bitnami/haproxy>= 2.0.0, < 2.0.25, >= 2.2.0, < 2.2.17, >= 2.3.0, < 2.3.14, >= 2.4.0, < 2.4.4
- Debian/haproxyfrom 0, < 2.2.9-2+deb11u2
- Debian/haproxyfrom 0, < 2.2.9-2+deb11u2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
References (12)
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-40346
- WEBhttps://git.haproxy.org/?p=haproxy.git
- WEBhttps://github.com/haproxy/haproxy/commit/3b69886f7dcc3cfb3d166309018e6cfec9ce2c95
- WEBhttps://jfrog.com/blog/critical-vulnerability-in-haproxy-cve-2021-40346-integer-overflow-enables-http-smuggling/
- WEBhttps://lists.apache.org/thread.html/r284567dd7523f5823e2ce995f787ccd37b1cc4108779c50a97c79120%40%3Cdev.cloudstack.apache.org%3E
- WEBhttps://lists.apache.org/thread.html/r8a58fd7a29808e5d27ee56877745e58dc4bb041b9af94601554e2a5a%40%3Cdev.cloudstack.apache.org%3E
- WEBhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A7V2IYO22LWVBGUNZWVKNTMDV4KINLFO/
- WEBhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXTSBY2TEAXWZVFQM3CXHJFRONX7PEMN/
- WEBhttps://nvd.nist.gov/vuln/detail/CVE-2021-40346
- WEBhttps://www.debian.org/security/2021/dsa-4968
- WEBhttps://www.mail-archive.com/haproxy%40formilux.org
- WEBhttps://www.mail-archive.com/haproxy%40formilux.org/msg41114.html