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.
結論預警: CVE-2016-2851 綜合評估為高可利用風險（92.5/100）：CVSS 技術影響為嚴重級，利用機率偏高（EPSS 25.40%，百分位 98%） 核心證據: 已收錄 4 筆公開利用參考（Exploit-DB）。 近一日 EPSS 上升 +4.14%，被利用關注度持續升高。 強制指令: 存在公開利用—請盤點暴露面、落實緩解措施並優先修補。
風險隨態勢動態變化；本站持續評估並同步更新本頁展示內容。
| EDB-ID | 來源 | 類型 | 公開時間 | 連結 |
|---|---|---|---|---|
| 39550 | exploit_db | edb | 2016-03-10 | Exploit-DB ↗ |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ | |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ | |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS 日更估計相對被利用可能性；百分位表示該 CVE 在已評分漏洞中的相對排名（越高表示相對更嚴重）。
| # | 日期 | 舊 EPSS 分數 | 新 EPSS 分數 | 變化（新 − 舊） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 21.26% | 25.40% | +4.14% |
| 2 | 2026-05-30 | 23.06% | 21.26% | -1.80% |
| 3 | 2025-07-13 | — | 23.06% | — |
完整 EPSS 歷史 （共 13 筆）
該 CVE 的 CVSS 指標。
| 底座分 | 版本 | 嚴重度 | 向量 | 可利用性 | 影響 | 分數來源 |
|---|---|---|---|---|---|---|
| 9.8 | 3.0 | CRITICAL |
|
3.9 | 5.9 | [email protected] |
| 7.5 | 2.0 | HIGH |
|
10.0 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2016-2851 not yet assigned priority: Debian including 1 source packages (libotr), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2016-2851 |
gentoo
|
normal | CVE-2016-2851: 1 GLSA(s) (201701-10), 2 atom(s) (net-libs/libotr, x11-plugins/pidgin-otr); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-2851 |
suse
|
medium | CVE-2016-2851 severity moderate: SUSE including 12 source package names (libotr, libotr-devel, …), 56 product×package rows across 37 product lines (SUSE Linux Enterprise Desktop 11 SP4, SUSE Linux Enterprise Desktop 12, … (37 product lines)): Fixed 42, Known Not Affected 14. | https://www.suse.com/security/cve/CVE-2016-2851/ |
ubuntu
|
medium | CVE-2016-2851 medium priority: Ubuntu including 1 source packages (libotr), 4 status rows across 4 suites (precise, trusty, upstream, wily): released 4. | https://ubuntu.com/security/CVE-2016-2851 |
| 廠商 | 產品 | 版本 | 原始 CPE |
|---|---|---|---|
| debian | debian_linux | 7.0 | cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* |
| debian | debian_linux | 8.0 | cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* |
| opensuse | leap | 42.1 | cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:* |
| opensuse | opensuse | 13.2 | cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:* |
| cypherpunks | libotr | <= 4.1.0 | cpe:2.3:a:cypherpunks:libotr:*:*:*:*:*:*:*:* |
| URL | 標籤 |
|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00021.html | Mailing List |
| http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00030.html | Vendor Advisory |
| http://seclists.org/fulldisclosure/2016/Mar/21 | Exploit Mailing List Third Party Advisory |
| http://www.debian.org/security/2016/dsa-3512 | Third Party Advisory |
| http://www.securityfocus.com/archive/1/537745/100/0/threaded | Third Party Advisory |
| http://www.securityfocus.com/bid/84285 | Third Party Advisory VDB Entry |
| http://www.ubuntu.com/usn/USN-2926-1 | Third Party Advisory |
| https://lists.cypherpunks.ca/pipermail/otr-users/2016-March/002581.html | Exploit |
| https://security.gentoo.org/glsa/201701-10 | Third Party Advisory |
| https://www.exploit-db.com/exploits/39550/ | Third Party Advisory VDB Entry |
| https://www.x41-dsec.de/lab/advisories/x41-2016-001-libotr/ | Exploit |