8.7

CVE-2025-59777: gnu project gnu libbmicrohttpd NULL Pointer Dereference

CVSS: 8.7v4.0HighAnalyzed
AliasesUBUNTU-CVE-2025-59777DEBIAN-CVE-2025-59777
Published 10-11-2025Last modified 10-11-2025
Open JSON

Vulnerability summary

CVE-2025-59777 is a high (CVSS 8.7) NULL Pointer Dereference vulnerability in gnu project gnu libbmicrohttpd. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 40.3% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.48%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Related 6
OPENSUSE-SU-2026:20016-1SUSE-SU-2025:21200-1SUSE-SU-2025:4291-1SUSE-SU-2026:20029-1SUSE-SU-2026:20057-1SUSE-SU-2026:20072-1

Timeline

  1. 10-11-2025
    PublishedVulnerability first disclosed.
  2. 10-11-2025
    Last modifiedVulnerability information updated.

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 metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.48%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

+0.05 pp

From 0.43% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.48%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • libmicrohttpdAll versions (No fix recorded)
Gnu1 product
Gnu project1 product
  • gnu libbmicrohttpdv1.0.2 and earlier (The vulnerability remains in the source code up until commit ff13abc on the master branch of the libmicrohttpd Git repository | after the v1.0.2 tag.)
Ubuntu1 product
  • libmicrohttpdAll versions (No fix recorded)

4 vendors · 4 products

References

7 links