Vulnerability in Haproxy
CVE-2021-39240
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 does not ensure that the scheme and path portions of a URI have the expected characters. For example, the authority field (as observed on a target HTTP/2 server) might differ from what the routing rules were intended to achieve.
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:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.022 (81.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.5% 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
Public proof-of-concept exploits
References
- www.mail-archive.com/haproxy@formilux.org/msg41041.html
- git.haproxy.org/
- 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-2021-39240?
- CVE-2021-39240 is a high-severity vulnerability in Haproxy. CVSS score: 7.5/10. Published 2021-08-17.
- How severe is CVE-2021-39240?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-39240 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.