exim: improper format string handling in DKIM signatures
Published Oct 5, 2011
7.5
HIGHCVSS 2.0
EPSS 3.94%
Description
Format string vulnerability in the dkim_exim_verify_finish function in src/dkim.c in Exim before 4.76 might allow remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via format string specifiers in data used in DKIM logging, as demonstrated by an identity field containing a % (percent) character.
Affected products
No data.
- ≤ 4.75
- 2.10
- 2.11
- 2.12
- 3.00
- 3.01
- 3.02
- 3.03
- 3.10
- 3.11
- 3.12
- 3.13
- 3.14
- 3.15
- 3.16
- 3.20
- 3.21
- 3.22
- 3.30
- 3.31
- 3.32
- 3.33
- 3.34
- 3.35
- 3.36
- 4.00
- 4.01
- 4.02
- 4.03
- 4.04
- 4.05
- 4.10
- 4.11
- 4.12
- 4.14
- 4.20
- 4.21
- 4.22
- 4.23
- 4.24
- 4.30
- 4.31
- 4.32
- 4.33
- 4.34
- 4.40
- 4.41
- 4.42
- 4.43
- 4.44
- 4.50
- 4.51
- 4.52
- 4.53
- 4.54
- 4.60
- 4.61
- 4.62
- 4.63
- 4.64
- 4.65
- 4.66
- 4.67
- 4.68
- 4.69
- 4.70
- 4.71
- 4.72
- 4.73
- 4.74
No data.
Red Hat Enterprise Linux 4
exim
Not affected
Red Hat Enterprise Linux 5
exim
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | exim | Not affected | n/a |
| Red Hat Enterprise Linux 5 | exim | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of exim as shipped with Red Hat Enterprise Linux 4 or 5 as they did not include support for DKIM.
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:L/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 (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.94% (0.03940) | 90.06th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.94% (0.03940) | 89.01th | v5 (v2026.06.15) |
| Apr 6, 2026 | 4.72% (0.04718) | 89.35th | v4 (v2025.03.14) |
| Aug 26, 2025 | 2.71% (0.02707) | 85.31th | v4 (v2025.03.14) |
| Mar 30, 2025 | 4.15% (0.04149) | 87.59th | v4 (v2025.03.14) |
| Mar 29, 2025 | 7.02% (0.07020) | 85.46th | v4 (v2025.03.14) |
| Mar 17, 2025 | 4.15% (0.04149) | 87.89th | v4 (v2025.03.14) |
| Dec 12, 2024 | 9.72% (0.09717) | 95.07th | v3 (v2023.03.01) |
| May 25, 2024 | 9.72% (0.09717) | 94.78th | v3 (v2023.03.01) |
| Apr 4, 2024 | 9.25% (0.09245) | 94.56th | v3 (v2023.03.01) |
| Oct 23, 2023 | 8.88% (0.08875) | 93.85th | v3 (v2023.03.01) |
| May 4, 2023 | 8.60% (0.08597) | 93.49th | v3 (v2023.03.01) |
| Mar 7, 2023 | 7.54% (0.07540) | 93.06th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.14% (0.05139) | 89.65th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.14% (0.05139) | 88.62th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.14% (0.05139) | 75.16th | v2 (v2022.01.01) |
References (10)
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=624670 x_refsource_CONFIRMPatch
- http://bugs.exim.org/show_bug.cgi?id=1106 x_refsource_CONFIRMPatch
- http://git.exim.org/exim.git/commit/337e3505b0e6cd4309db6bf6062b33fa56e06cf8 x_refsource_CONFIRMPatch
- http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00005.html vendor-advisoryx_refsource_SUSE
- http://secunia.com/advisories/51155 third-party-advisoryx_refsource_SECUNIA
- http://www.debian.org/security/2011/dsa-2232 vendor-advisoryx_refsource_DEBIAN
- https://access.redhat.com/security/cve/CVE-2011-1764 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=702474 x_refsource_CONFIRMPatchIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2011-1764
- https://www.cve.org/CVERecord?id=CVE-2011-1764
| Link | Providers | Tags |
|---|---|---|
| http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=624670 | x_refsource_CONFIRMPatch | |
| http://bugs.exim.org/show_bug.cgi?id=1106 | x_refsource_CONFIRMPatch | |
| http://git.exim.org/exim.git/commit/337e3505b0e6cd4309db6bf6062b33fa56e06cf8 | x_refsource_CONFIRMPatch | |
| http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00005.html | vendor-advisoryx_refsource_SUSE | |
| http://secunia.com/advisories/51155 | third-party-advisoryx_refsource_SECUNIA | |
| http://www.debian.org/security/2011/dsa-2232 | vendor-advisoryx_refsource_DEBIAN | |
| https://access.redhat.com/security/cve/CVE-2011-1764 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=702474 | x_refsource_CONFIRMPatchIssue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-1764 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-1764 |
Change history (0)
No recorded changes yet.