The (1) publickey_make_dss, (2) publickey_make_rsa, (3) signature_from_string, (4) ssh_do_sign, and (5) ssh_sign_session_id functions in keys.c in libssh before 0.5.3 free "an invalid pointer on an error path," which might allow remote attackers to cause a denial of service (crash) via unspecified vectors.
结论预警: CVE-2012-4561 综合评估为中等风险（52.8/100）：CVSS 技术影响为中级，利用概率偏高（EPSS 4.75%，百分位 91%） 核心证据: EPSS 显示该漏洞近期被利用的可能性处于高位。 近一日 EPSS 上升 +1.04%，被利用关注度持续升高。 强制指令: 被利用概率偏高—请排查暴露面并优先安排修补。
风险随态势动态变化；本站持续评估并同步更新本页展示内容。
EPSS 日更估计相对被利用可能性；百分位表示该 CVE 在已评分漏洞中的相对排名（越高表示相对更严重）。
| # | 日期 | 旧 EPSS 分数 | 新 EPSS 分数 | 变化（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 3.71% | 4.75% | +1.04% |
| 2 | 2025-03-30 | 5.12% | 3.71% | -1.41% |
| 3 | 2025-03-29 | — | 5.12% | — |
完整 EPSS 历史 （共 7 条）
该 CVE 的 CVSS 指标。
| 底座分 | 版本 | 严重度 | 向量 | 可利用性 | 影响 | 分数来源 |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2012-4561 not yet assigned priority: Debian including 1 source packages (libssh), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2012-4561 |
gentoo
|
normal | CVE-2012-4561: 1 GLSA(s) (201402-26), 1 atom(s) (net-libs/libssh); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2012-4561 |
suse
|
medium | CVE-2012-4561 severity moderate: SUSE including 36 source package names (libssh, libssh-config-0.10.6-1.12, …), 65 product×package rows across 29 product lines (SUSE Linux Enterprise Desktop 12, SUSE Linux Enterprise Desktop 12 SP1, … (29 product lines)): Fixed 52, Known Not Affected 13. | https://www.suse.com/security/cve/CVE-2012-4561/ |
ubuntu
|
low | CVE-2012-4561 low priority: Ubuntu including 1 source packages (libssh), 6 status rows across 6 suites (hardy, lucid, oneiric, precise, quantal, upstream): released 5, ignored 1. | https://ubuntu.com/security/CVE-2012-4561 |
| 厂商 | 产品 | 版本 | 原始 CPE |
|---|---|---|---|
| libssh | libssh | <= 0.5.2 | cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:* |
| libssh | libssh | 0.4.7 | cpe:2.3:a:libssh:libssh:0.4.7:*:*:*:*:*:*:* |
| libssh | libssh | 0.4.8 | cpe:2.3:a:libssh:libssh:0.4.8:*:*:*:*:*:*:* |
| libssh | libssh | 0.5.0 | cpe:2.3:a:libssh:libssh:0.5.0:*:*:*:*:*:*:* |
| libssh | libssh | 0.5.0 | cpe:2.3:a:libssh:libssh:0.5.0:rc1:*:*:*:*:*:* |
| libssh | libssh | 0.5.1 | cpe:2.3:a:libssh:libssh:0.5.1:*:*:*:*:*:*:* |