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Vulnerability record · CVE-2025-59777 · published 10 November 2025

CVE-2025-59777: Gnu libmicrohttpd null pointer dereference vulnerability

Gnu · Libmicrohttpd

NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier. The vulnerability was fixed in commit ff13abc on the master branch of the libmicrohttpd Git repository, after the v1.0.2 tag. A specially crafted packet sent by an attacker could cause a denial-of-service (DoS) condition.

8.7 CVSS 4.0 High EPSS 0.43% · top 65.1% CWE-476 · NULL pointer dereference
8.7CVSS 4.0 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier. The vulnerability was fixed in commit ff13abc on the master branch of the libmicrohttpd Git repository, after the v1.0.2 tag. A specially crafted packet sent by an attacker could cause a denial-of-service (DoS) condition.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.gnunet.org/libmicrohttpd.git/commit/?id=ff13abc1c1d7d2b30d69d5c0bd4a237e1801c50b Patch
https://jvn.jp/en/jp/JVN76719218/ Third Party Advisory
https://www.gnu.org/software/libmicrohttpd/ Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-3466Gnu libmicrohttpd classic buffer overflow vulnerabilityA flaw was found in libmicrohttpd. A missing bounds check in the post_process_urlencoded function leads to a buffer overflow, allowing a remote attac…EPSS 8.7%8.7CVE-2025-62689Gnu libmicrohttpd heap-based buffer overflow vulnerabilityNULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier. The vulnerability was fixed in commit ff13abc on the master br…EPSS 0.43%6.4CVE-2013-7038Gnu libmicrohttpd memory buffer overflow vulnerabilityThe MHD_http_unescape function in libmicrohttpd before 0.9.32 might allow remote attackers to obtain sensitive information or cause a denial of servi…EPSS 1.8%5.9CVE-2023-27371Gnu libmicrohttpd out-of-bounds read vulnerabilityGNU libmicrohttpd before 0.9.76 allows remote DoS (Denial of Service) due to improper parsing of a multipart/form-data boundary in the postprocessor.…EPSS 1.3%5.1CVE-2013-7039Gnu libmicrohttpd memory buffer overflow vulnerabilityStack-based buffer overflow in the MHD_digest_auth_check function in libmicrohttpd before 0.9.32, when MHD_OPTION_CONNECTION_MEMORY_LIMIT is set to a…EPSS 3.3%6.2CVE-2026-21525Windows Remote Access Connection Manager null pointer dereference DoSWindows Remote Access Connection Manager contains a null pointer dereference (CWE-476) that lets an unauthorized attacker deny service locally. The f…KEVEPSS 4.8%analysed

Source: NIST National Vulnerability Database (record CVE-2025-59777), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.