Vulnerability · Published Aug 17, 2021 · Assigned by mitre
CVE-2021-39242
High 7.5
In plain English
A high-severity security flaw in the haproxy package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.2% (higher than 83% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)2.2%top 17.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It can lead to a situation with an attacker-controlled HTTP Host header, because a mismatch between Host and authority is mishandled.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | haproxy | 2.2.16-1 | DEBIAN-CVE-2021-39242 |
| Debian:13 | haproxy | 2.2.16-1 | DEBIAN-CVE-2021-39242 |
| Debian:14 | haproxy | 2.2.16-1 | DEBIAN-CVE-2021-39242 |
Affected products (as reported)
References
- https://www.mail-archive.com/haproxy%40formilux.org/msg41041.html x_refsource_MISC
- https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=b5d2b9e154d78e4075db163826c5e0f6d31b2ab1 x_refsource_MISC
- DSA-4960 vendor-advisory, x_refsource_DEBIAN
- FEDORA-2021-e6557245e8 vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-3ab4512c98 vendor-advisory, x_refsource_FEDORA