What’s Vulnerable › Vulnerabilities
CVE-2023-27371
- Severity: medium (CVSS 5.9 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.3% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2023-02-28 · updated 2026-10-14
- Weakness: CWE-125
Description
GNU libmicrohttpd before 0.9.76 allows remote DoS (Denial of Service) due to improper parsing of a multipart/form-data boundary in the postprocessor.c MHD_create_post_processor() method. This allows an attacker to remotely send a malicious HTTP POST packet that includes one or more '\0' bytes in a multipart/form-data boundary field, which - assuming a specific heap layout - will result in an out-of-bounds read and a crash in the find_boundary() function.
Affected products
- GNU Libmicrohttpd: before 0.9.76 — fixed in 0.9.76
How to fix
Upgrade to a fixed version: GNU Libmicrohttpd 0.9.76. Check the vendor advisory for mitigations.
References
- https://git.gnunet.org/libmicrohttpd.git/commit/?id=6d6846e20bfdf4b3eb1b592c97520a532f724238
- https://github.com/0xhebi/CVEs/tree/main/GNU%20Libmicrohttpd
- https://lists.debian.org/debian-lts-announce/2023/03/msg00029.html
- https://lists.gnu.org/archive/html/libmicrohttpd/2023-02/msg00000.html
- https://git.gnunet.org/libmicrohttpd.git/commit/?id=6d6846e20bfdf4b3eb1b592c97520a532f724238
- https://github.com/0xhebi/CVEs/tree/main/GNU%20Libmicrohttpd
- https://lists.debian.org/debian-lts-announce/2023/03/msg00029.html
- https://lists.gnu.org/archive/html/libmicrohttpd/2023-02/msg00000.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
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