CVE-2009-2474

neon before 0.28.6, when OpenSSL or GnuTLS 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.

Published: 2009-08-21 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-2474 is rated Moderate Risk (47.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.38%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2009-2474

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.60% 1.38% +0.78%
2 2026-05-06 0.43% 0.60% +0.17%
3 2025-03-17 — 0.43% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-2474

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 4.9 [email protected]

Weakness enumeration for CVE-2009-2474

OS Trackers for CVE-2009-2474

vendor priority summary link
debian low CVE-2009-2474 low priority: Debian including 2 source packages (litmus, neon27), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2009-2474
redhat medium — https://access.redhat.com/security/cve/CVE-2009-2474
suse medium CVE-2009-2474 severity moderate: SUSE including 20 source package names (libneon-devel-0.29.6-6.7.1, libneon-devel-0.30.0-3.65, …), 53 product×package rows across 30 product lines (SUSE Linux Enterprise Desktop 12, SUSE Linux Enterprise Desktop 12 SP1, … (30 product lines)): Fixed 53. https://www.suse.com/security/cve/CVE-2009-2474/
ubuntu medium CVE-2009-2474 medium priority: Ubuntu including 3 source packages (neon, neon26, neon27), 42 status rows across 14 suites (dapper, hardy, intrepid, jaunty, karmic, lucid, maverick, natty, oneiric, precise, quantal, raring, saucy, upstream): DNE 21, not-affected 9, ignored 5, released 5, needs-triage 2. https://ubuntu.com/security/CVE-2009-2474

Affected software / configurations for CVE-2009-2474

Vendor Product Version Raw CPE
webdav neon < 0.28.6 cpe:2.3:a:webdav:neon:*:*:*:*:*:*:*:*
apple mac_os_x < 10.6.5 cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
canonical ubuntu_linux 6.06 cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:lts:*:*:*
canonical ubuntu_linux 8.04 cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 8.10 cpe:2.3:o:canonical:ubuntu_linux:8.10:*:*:*:*:*:*:*
canonical ubuntu_linux 9.04 cpe:2.3:o:canonical:ubuntu_linux:9.04:*:*:*:*:*:*:*
fedoraproject fedora 10 cpe:2.3:o:fedoraproject:fedora:10:*:*:*:*:*:*:*
fedoraproject fedora 11 cpe:2.3:o:fedoraproject:fedora:11:*:*:*:*:*:*:*

References for CVE-2009-2474

URL Tags
http://lists.apple.com/archives/security-announce/2010//Nov/msg00000.html Mailing List Third Party Advisory
http://lists.manyfish.co.uk/pipermail/neon/2009-August/001044.html Mailing List Third Party Advisory
http://lists.manyfish.co.uk/pipermail/neon/2009-August/001046.html Mailing List Third Party Advisory
http://secunia.com/advisories/36371 Third Party Advisory
http://secunia.com/advisories/36799 Third Party Advisory
http://support.apple.com/kb/HT4435 Broken Link
http://www.mandriva.com/security/advisories?name=MDVSA-2009:221 Third Party Advisory
http://www.securityfocus.com/bid/36079 Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/usn-835-1 Third Party Advisory
http://www.vupen.com/english/advisories/2009/2341 Permissions Required
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11721 Third Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00924.html Mailing List Third Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00945.html Mailing List Third Party Advisory
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