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.
総合評価: CVE-2016-2851 は悪用リスクが高い(92.5/100)。CVSS 深刻度は重大。悪用される可能性が高い(EPSS 25.40%、98 パーセンタイル) 根拠: 公開エクスプロイトが 4 件参照されています(Exploit-DB)。 直近 1 日で EPSS が +4.14% 上昇。悪用への関心が高まっている可能性があります。 推奨対応: 公開エクスプロイトが確認されています。影響範囲の確認、緩和策の適用、パッチ適用を優先してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
| EDB-ID | ソース | 種別 | 公開 | リンク |
|---|---|---|---|---|
| 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 は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置(高いほど相対的に深刻)を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ(新 − 旧) |
|---|---|---|---|---|
| 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% | — |
EPSS の全履歴 (全 13 件)
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 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 |
| ベンダー | 製品 | バージョン | 生の 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 | タグ |
|---|---|
| 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 |