{"id":"CVE-2023-27371","title":"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","summary":"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 malicio…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-125"],"vendor":"gnu","product":"libmicrohttpd","affected":["libmicrohttpd < 0.9.76"],"patched":["libmicrohttpd 0.9.76"],"published":"2023-02-28","updated":"2026-10-14","sourceUpdated":"2026-10-14T23:17:15.870","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-27371","references":[{"url":"https://git.gnunet.org/libmicrohttpd.git/commit/?id=6d6846e20bfdf4b3eb1b592c97520a532f724238","label":"cve@mitre.org"},{"url":"https://github.com/0xhebi/CVEs/tree/main/GNU%20Libmicrohttpd","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2023/03/msg00029.html","label":"cve@mitre.org"},{"url":"https://lists.gnu.org/archive/html/libmicrohttpd/2023-02/msg00000.html","label":"cve@mitre.org"},{"url":"https://git.gnunet.org/libmicrohttpd.git/commit/?id=6d6846e20bfdf4b3eb1b592c97520a532f724238","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/0xhebi/CVEs/tree/main/GNU%20Libmicrohttpd","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2023/03/msg00029.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.gnu.org/archive/html/libmicrohttpd/2023-02/msg00000.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.01253,"epssPercentile":0.68871,"ingestedAt":"2026-10-15T00:02:07.128Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2025-03-11T15:18:56.784683Z"},"slug":"CVE-2023-27371","body":"## Overview\n\nGNU 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.\n\n## Affected\n\n- `libmicrohttpd < 0.9.76`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libmicrohttpd 0.9.76`","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}