mutt: Doesn't properly handle NULL character in subject Common Name
Published Oct 23, 2009
6.8
MEDIUMCVSS 2.0
EPSS 1.08%
Description
mutt_ssl.c in mutt 1.5.19 and 1.5.20, 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.
Affected products
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of mutt as shipped with Red Hat Enterprise Linux 3, 4, or 5.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.08% (0.01084) | 63.99th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.08% (0.01084) | 60.76th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.34% (0.00343) | 54.69th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00057) | 25.53th | v3 (v2023.03.01) |
| Apr 25, 2024 | 0.07% (0.00073) | 30.40th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.05% (0.00053) | 18.20th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00057) | 21.67th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.02% (0.01018) | 38.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
References (8)
- http://dev.mutt.org/trac/changeset/6016:dc09812e63a3/mutt_ssl.c x_refsource_CONFIRM
- http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00001.html vendor-advisoryx_refsource_SUSE
- http://marc.info/?l=oss-security&m=125198917018936&w=2 mailing-listx_refsource_MLIST
- http://marc.info/?l=oss-security&m=125369675820512&w=2 mailing-listx_refsource_MLIST
- https://access.redhat.com/security/cve/CVE-2009-3765 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=530713 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2009-3765
- https://www.cve.org/CVERecord?id=CVE-2009-3765
| Link | Providers | Tags |
|---|---|---|
| http://dev.mutt.org/trac/changeset/6016:dc09812e63a3/mutt_ssl.c | x_refsource_CONFIRM | |
| http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00001.html | vendor-advisoryx_refsource_SUSE | |
| http://marc.info/?l=oss-security&m=125198917018936&w=2 | mailing-listx_refsource_MLIST | |
| http://marc.info/?l=oss-security&m=125369675820512&w=2 | mailing-listx_refsource_MLIST | |
| https://access.redhat.com/security/cve/CVE-2009-3765 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=530713 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2009-3765 | ||
| https://www.cve.org/CVERecord?id=CVE-2009-3765 |
Change history (0)
No recorded changes yet.