Buffer overflow in Gnu Libmicrohttpd
CVE-2021-3466
A flaw was found in libmicrohttpd. A missing bounds check in the post_process_urlencoded function leads to a buffer overflow, allowing a remote attacker to write arbitrary data in an application that uses libmicrohttpd. The highest threat…
Vulnerability class: Buffer Overflow
EPSS: 0.087 (94.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Gnu Libmicrohttpd — versions 0.9.70
- Fedoraproject Fedora — versions 32, 33, 34
- Redhat Enterprise_linux — versions 6.0, 7.0, 8.0
- N/a Libmicrohttpd — versions libmicrohttpd 0.9.70
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Patch, Third Party Advisory, Issue Tracking)
- secalert@redhat.com (vendor-advisory)
- secalert@redhat.com (vendor-advisory)
- secalert@redhat.com (vendor-advisory)
- secalert@redhat.com (vendor-advisory)
Frequently asked questions
- What is CVE-2021-3466?
- CVE-2021-3466 is a critical-severity vulnerability in Gnu Libmicrohttpd, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-03-25.
- How severe is CVE-2021-3466?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-3466 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.