Off-by-one error in the XML signature feature in Apache XML Security for C++ 1.6.0, as used in Shibboleth before 2.4.3 and possibly other products, allows remote attackers to cause a denial of service (crash) via a signature using a large RSA key, which triggers a buffer overflow.
結論預警: CVE-2011-2516 綜合評估為高可利用風險（68.3/100）：CVSS 技術影響為中級，利用機率偏高（EPSS 7.72%，百分位 94%） 核心證據: 已收錄 1 筆公開利用參考（Exploit-DB）。 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 |
|---|---|---|---|---|
| — | 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 | 7.30% | 7.72% | +0.42% |
| 2 | 2025-03-30 | 9.83% | 7.30% | -2.53% |
| 3 | 2025-03-29 | — | 9.83% | — |
完整 EPSS 歷史 （共 8 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 |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
low | CVE-2011-2516 low priority: Debian including 1 source packages (xml-security-c), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2011-2516 |
ubuntu
|
medium | CVE-2011-2516 medium priority: Ubuntu including 2 source packages (shibboleth-sp2, xml-security-c), 36 status rows across 18 suites (artful, hardy, lucid, maverick, natty, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): not-affected 16, ignored 13, released 4, DNE 3. | https://ubuntu.com/security/CVE-2011-2516 |
| 廠商 | 產品 | 版本 | 原始 CPE |
|---|---|---|---|
| apache | xml_security_for_c\+\+ | 1.6.0 | cpe:2.3:a:apache:xml_security_for_c\+\+:1.6.0:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | <= 2.4.2 | cpe:2.3:a:shibboleth:shibboleth-sp:*:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 1.3.1 | cpe:2.3:a:shibboleth:shibboleth-sp:1.3.1:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 1.3.2 | cpe:2.3:a:shibboleth:shibboleth-sp:1.3.2:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 1.3.3 | cpe:2.3:a:shibboleth:shibboleth-sp:1.3.3:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 1.3.4 | cpe:2.3:a:shibboleth:shibboleth-sp:1.3.4:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 1.3.5 | cpe:2.3:a:shibboleth:shibboleth-sp:1.3.5:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 1.3f | cpe:2.3:a:shibboleth:shibboleth-sp:1.3f:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 2.0 | cpe:2.3:a:shibboleth:shibboleth-sp:2.0:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 2.1 | cpe:2.3:a:shibboleth:shibboleth-sp:2.1:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 2.2 | cpe:2.3:a:shibboleth:shibboleth-sp:2.2:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 2.2.1 | cpe:2.3:a:shibboleth:shibboleth-sp:2.2.1:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 2.3 | cpe:2.3:a:shibboleth:shibboleth-sp:2.3:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 2.3.1 | cpe:2.3:a:shibboleth:shibboleth-sp:2.3.1:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 2.4 | cpe:2.3:a:shibboleth:shibboleth-sp:2.4:*:*:*:*:*:*:* |
| shibboleth | shibboleth-sp | 2.4.1 | cpe:2.3:a:shibboleth:shibboleth-sp:2.4.1:*:*:*:*:*:*:* |