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Fencer Vulns
high 7.5

CVE-2009-2730 json

libgnutls in GnuTLS before 2.8.2 does not properly handle a '\0' character in a domain name in the subject's (1) Common Name (CN) or (2) Su…

published 2009-08-12 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2721

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

libgnutls in GnuTLS before 2.8.2 does not properly handle a '\0' character in a domain name in the subject's (1) Common Name (CN) or (2) Subject Alternative Name (SAN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority.

Patch / fix

  • gnutls RHEL 4 1.0.20-4.el4_8.3
  • gnutls RHEL 5 1.4.1-3.el5_3.5
  • gnutls-utils RHEL 5 1.4.1-3.el5_3.5

red hat advisories RHSA-2009:1232

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-2730 updated cvss 4.0

gnutls: incorrect verification of SSL certificate with NUL in name (GNUTLS-SA-2009-4)

  • Red Hat Enterprise Linux (v. 5 server) gnutls 1.4.1-3.el5_3.5, gnutls-utils 1.4.1-3.el5_3.5 Red Hat Enterprise Linux AS version 4 gnutls 1.0.20-4.el4_8.3 Red Hat Enterprise Linux Desktop (v. 5 client) gnutls 1.4.1-3.el5_3.5, gnutls-utils 1.4.1-3.el5_3.5 Red Hat Enterprise Linux Desktop version 4 gnutls 1.0.20-4.el4_8.3 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) gnutls 1.4.1-3.el5_3.5, gnutls-utils 1.4.1-3.el5_3.5 Red Hat Enterprise Linux ES version 4 gnutls 1.0.20-4.el4_8.3
    +1 more products
    Red Hat Enterprise Linux WS version 4 gnutls 1.0.20-4.el4_8.3
    fixed: vendor fix RHSA-2009:1232

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.15% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.