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Fencer Vulns
high 7.5

CVE-2009-2417 json

lib/ssluse.c in cURL and libcurl 7.4 through 7.19.5, when OpenSSL is used, does not properly handle a '\0' character in a domain name in th…

published 2009-08-14 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2413

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.5%
EPSS 3.5% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

lib/ssluse.c in cURL and libcurl 7.4 through 7.19.5, when OpenSSL is used, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) 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, a related issue to CVE-2009-2408.

Patch / fix

  • curl Debian 14, Debian 13, Debian 12 7.19.5-1.1

debian advisories DEBIAN-CVE-2009-2417

  • curl RHEL 3 7.10.6-10.rhel3
  • curl RHEL 4 7.12.1-11.1.el4_8.1
  • curl RHEL 5 7.15.5-2.1.el5_3.5

red hat advisories RHSA-2009:1209

  • curl openSUSE Tumbleweed 7.51.0-1.1

opensuse advisories openSUSE-SU-2024:10303-1

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-2009-2417 updated cvss 4.0

curl: incorrect verification of SSL certificate with NUL in name

  • Red Hat Desktop version 3 curl 7.10.6-10.rhel3 Red Hat Enterprise Linux (v. 5 server) curl 7.15.5-2.1.el5_3.5 Red Hat Enterprise Linux AS version 3 curl 7.10.6-10.rhel3 Red Hat Enterprise Linux AS version 4 curl 7.12.1-11.1.el4_8.1 Red Hat Enterprise Linux Desktop (v. 5 client) curl 7.15.5-2.1.el5_3.5 Red Hat Enterprise Linux Desktop version 4 curl 7.12.1-11.1.el4_8.1
    +5 more products
    Red Hat Enterprise Linux Desktop Workstation (v. 5 client) curl 7.15.5-2.1.el5_3.5 Red Hat Enterprise Linux ES version 3 curl 7.10.6-10.rhel3 Red Hat Enterprise Linux ES version 4 curl 7.12.1-11.1.el4_8.1 Red Hat Enterprise Linux WS version 3 curl 7.10.6-10.rhel3 Red Hat Enterprise Linux WS version 4 curl 7.12.1-11.1.el4_8.1
    fixed: vendor fix RHSA-2009:1209

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

3.46% chance of exploitation in the next 30 days, higher than 89% 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.