CRITICAL
Integer overflow in proto.c in libotr before 4.1.1 on 64-bit platforms allows remote attackers to cause a denial of service (memory corruption and application crash) or execute arbitrary code via a series of large OTR messages, which triggers a heap-based buffer overflow
Published Apr 7, 2016
9.8
CRITICALCVSS 3.0
EPSS 25.40%
Description
Integer overflow in proto.c in libotr before 4.1.1 on 64-bit platforms allows remote attackers to cause a denial of service (memory corruption and application crash) or execute arbitrary code via a series of large OTR messages, which triggers a heap-based buffer overflow.
Affected products
No data.
Configuration 1
OR
- 7.0
- 8.0
Configuration 3
- ≤ 4.1.0
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.
9.8 CRITICAL NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
25.40% 0.25400
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.25400
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 (23 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 25.40% (0.25400) | 97.89th | v5 (v2026.06.15) |
| Sep 22, 2026 | 25.40% (0.25400) | 97.85th | v5 (v2026.06.15) |
| Sep 21, 2026 | 20.93% (0.20930) | 97.50th | v5 (v2026.06.15) |
| Sep 6, 2026 | 25.40% (0.25400) | 97.80th | v5 (v2026.06.15) |
| Sep 5, 2026 | 20.93% (0.20930) | 97.44th | v5 (v2026.06.15) |
| Aug 30, 2026 | 25.40% (0.25400) | 97.79th | v5 (v2026.06.15) |
| Aug 28, 2026 | 20.93% (0.20930) | 97.43th | v5 (v2026.06.15) |
| Aug 24, 2026 | 25.40% (0.25400) | 97.78th | v5 (v2026.06.15) |
| Aug 23, 2026 | 20.93% (0.20930) | 97.42th | v5 (v2026.06.15) |
| Jun 15, 2026 | 25.40% (0.25400) | 97.67th | v5 (v2026.06.15) |
| May 30, 2026 | 21.26% (0.21262) | 95.78th | v4 (v2025.03.14) |
| Jul 13, 2025 | 23.06% (0.23058) | 95.65th | v4 (v2025.03.14) |
| Apr 13, 2025 | 18.77% (0.18771) | 94.80th | v4 (v2025.03.14) |
| Mar 30, 2025 | 24.75% (0.24750) | 95.68th | v4 (v2025.03.14) |
| Mar 29, 2025 | 35.80% (0.35802) | 95.51th | v4 (v2025.03.14) |
| Mar 19, 2025 | 24.75% (0.24750) | 95.48th | v4 (v2025.03.14) |
| Mar 17, 2025 | 22.03% (0.22033) | 95.32th | v4 (v2025.03.14) |
| Dec 12, 2024 | 3.60% (0.03596) | 92.01th | v3 (v2023.03.01) |
| Sep 18, 2023 | 3.60% (0.03596) | 90.53th | v3 (v2023.03.01) |
| May 31, 2023 | 3.57% (0.03568) | 90.25th | v3 (v2023.03.01) |
| Mar 7, 2023 | 4.16% (0.04158) | 90.86th | v3 (v2023.03.01) |
| Mar 6, 2023 | 36.80% (0.36795) | 97.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 36.80% (0.36795) | 97.00th | v2 (v2022.01.01) |
Weaknesses (1)
References (11)
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00021.html vendor-advisoryx_refsource_SUSEMailing List
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00030.html vendor-advisoryx_refsource_SUSEVendor Advisory
- http://seclists.org/fulldisclosure/2016/Mar/21 mailing-listx_refsource_FULLDISCExploitMailing ListThird Party Advisory
- http://www.debian.org/security/2016/dsa-3512 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.securityfocus.com/archive/1/537745/100/0/threaded mailing-listx_refsource_BUGTRAQThird Party Advisory
- http://www.securityfocus.com/bid/84285 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-2926-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://lists.cypherpunks.ca/pipermail/otr-users/2016-March/002581.html mailing-listx_refsource_MLISTExploit
- https://security.gentoo.org/glsa/201701-10 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.exploit-db.com/exploits/39550/ exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
- https://www.x41-dsec.de/lab/advisories/x41-2016-001-libotr/ x_refsource_MISCExploit
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Apr 7, 2016
Updated Aug 5, 2024
Reserved Mar 6, 2016
Link CVE-2016-2851
CISA Vulnrichment
Updated n/a