The (1) otrl_base64_otr_decode function in src/b64.c; (2) otrl_proto_data_read_flags and (3) otrl_proto_accept_data functions in src/proto.c; and (4) decode function in toolkit/parse.c in libotr before 3.2.1 allocates a zero-length buffer when decoding a base64 string, which allows remote attackers to cause a denial of service (application crash) via a message with the value "?OTR:===.", which triggers a heap-based buffer overflow
Published Aug 20, 2012
4.3
MEDIUMCVSS 2.0
EPSS 3.44%
Description
The (1) otrl_base64_otr_decode function in src/b64.c; (2) otrl_proto_data_read_flags and (3) otrl_proto_accept_data functions in src/proto.c; and (4) decode function in toolkit/parse.c in libotr before 3.2.1 allocates a zero-length buffer when decoding a base64 string, which allows remote attackers to cause a denial of service (application crash) via a message with the value "?OTR:===.", which triggers a heap-based buffer overflow.
Affected products
No data.
- ≤ 3.2.0
- 3.1.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
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:N/I:N/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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.44% (0.03441) | 88.58th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.44% (0.03441) | 87.40th | v5 (v2026.06.15) |
| Feb 14, 2026 | 3.16% (0.03165) | 86.62th | v4 (v2025.03.14) |
| Mar 17, 2025 | 4.58% (0.04584) | 88.49th | v4 (v2025.03.14) |
| Dec 12, 2024 | 3.61% (0.03610) | 92.02th | v3 (v2023.03.01) |
| Mar 20, 2024 | 3.61% (0.03610) | 91.43th | v3 (v2023.03.01) |
| Mar 7, 2023 | 4.23% (0.04227) | 90.92th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.41% (0.03407) | 84.65th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.41% (0.03407) | 83.10th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.41% (0.03407) | 66.20th | v2 (v2022.01.01) |
References (16)
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684121 x_refsource_MISC
- http://lists.cypherpunks.ca/pipermail/otr-dev/2012-July/001347.html mailing-listx_refsource_MLIST
- http://lists.cypherpunks.ca/pipermail/otr-dev/2012-July/001348.html mailing-listx_refsource_MLIST
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00016.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00019.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00019.html vendor-advisoryx_refsource_SUSE
- http://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr%3Ba=commitdiff%3Bh=1902baee5d4b056850274ed0fa8c2409f1187435 x_refsource_CONFIRM
- http://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr%3Ba=commitdiff%3Bh=6d4ca89cf1d3c9a8aff696c3a846ac5a51f762c1 x_refsource_CONFIRM
- http://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr%3Ba=commitdiff%3Bh=b17232f86f8e60d0d22caf9a2400494d3c77da58 x_refsource_CONFIRM
- http://www.debian.org/security/2012/dsa-2526 vendor-advisoryx_refsource_DEBIAN
- http://www.mandriva.com/security/advisories?name=MDVSA-2012:131 vendor-advisoryx_refsource_MANDRIVA
- http://www.mandriva.com/security/advisories?name=MDVSA-2013:097 vendor-advisoryx_refsource_MANDRIVA
- http://www.securityfocus.com/bid/54907 vdb-entryx_refsource_BID
- http://www.ubuntu.com/usn/USN-1541-1 vendor-advisoryx_refsource_UBUNTU
- https://bugzilla.redhat.com/show_bug.cgi?id=846377 x_refsource_MISC
- https://exchange.xforce.ibmcloud.com/vulnerabilities/77528 vdb-entryx_refsource_XF
Change history (0)
No recorded changes yet.