Vulnerability in Haproxy
CVE-2021-39242
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.022 (81.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.023 · newest: 0.022 · change: -0.002
Affected products
- Haproxy
- Debian Linux — versions 11.0
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
References
- www.mail-archive.com/haproxy@formilux.org/msg41041.html
- git.haproxy.org/
- www.debian.org/security/2021/dsa-4960 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2021-39242?
- CVE-2021-39242 is a high-severity vulnerability in Haproxy, classified under Improper Handling of Exceptional Conditions. CVSS score: 7.5/10. Published 2021-08-17.
- How severe is CVE-2021-39242?
- High severity. CVSS v3 base score is 7.5 out of 10.