Double free vulnerability in Esi.cc in Squid 3.x before 3.5.18 and 4.x before 4.0.10 allows remote servers to cause a denial of service (crash) via a crafted Edge Side Includes (ESI) response.
結論預警: CVE-2016-4556 綜合評估為中等風險（59.1/100）：CVSS 技術影響為高級，利用機率偏高（EPSS 23.11%，百分位 97%） 核心證據: EPSS 顯示該漏洞近期被利用的可能性處於高位。 強制指令: 被利用機率偏高—請盤點暴露面並優先安排修補。
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。
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 | 56.86% | 23.11% | -33.75% |
| 2 | 2026-03-04 | 67.25% | 56.86% | -10.39% |
| 3 | 2026-03-01 | — | 67.25% | — |
完整 EPSS 歷史 （共 50 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 |
|---|---|---|---|---|---|---|
| 7.5 | 3.0 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2016-4556 unimportant priority: Debian including 1 source packages (squid), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2016-4556 |
gentoo
|
normal | CVE-2016-4556: 1 GLSA(s) (201607-01), 1 atom(s) (net-proxy/squid); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-4556 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2016-4556 |
suse
|
medium | CVE-2016-4556 severity moderate: SUSE including 14 source package names (squid, squid-3.3.14-20.2, …), 42 product×package rows across 38 product lines (HPE Helion OpenStack 8, SUSE Liberty Linux 7, … (38 product lines)): Known Not Affected 22, Fixed 20. | https://www.suse.com/security/cve/CVE-2016-4556/ |
ubuntu
|
medium | CVE-2016-4556 medium priority: Ubuntu including 1 source packages (squid3), 5 status rows across 5 suites (precise, trusty, upstream, wily, xenial): released 4, needs-triage 1. | https://ubuntu.com/security/CVE-2016-4556 |
: <a href="http://cwe.mitre.org/data/definitions/415.html">CWE-415: Double Free</a>
| 廠商 | 產品 | 版本 | 原始 CPE |
|---|---|---|---|
| squid-cache | squid | 3.0 | cpe:2.3:a:squid-cache:squid:3.0:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1 | cpe:2.3:a:squid-cache:squid:3.1:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.1 | cpe:2.3:a:squid-cache:squid:3.1.0.1:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.2 | cpe:2.3:a:squid-cache:squid:3.1.0.2:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.3 | cpe:2.3:a:squid-cache:squid:3.1.0.3:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.4 | cpe:2.3:a:squid-cache:squid:3.1.0.4:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.5 | cpe:2.3:a:squid-cache:squid:3.1.0.5:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.6 | cpe:2.3:a:squid-cache:squid:3.1.0.6:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.7 | cpe:2.3:a:squid-cache:squid:3.1.0.7:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.8 | cpe:2.3:a:squid-cache:squid:3.1.0.8:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.9 | cpe:2.3:a:squid-cache:squid:3.1.0.9:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.10 | cpe:2.3:a:squid-cache:squid:3.1.0.10:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.11 | cpe:2.3:a:squid-cache:squid:3.1.0.11:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.12 | cpe:2.3:a:squid-cache:squid:3.1.0.12:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.13 | cpe:2.3:a:squid-cache:squid:3.1.0.13:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.14 | cpe:2.3:a:squid-cache:squid:3.1.0.14:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.15 | cpe:2.3:a:squid-cache:squid:3.1.0.15:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.16 | cpe:2.3:a:squid-cache:squid:3.1.0.16:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.17 | cpe:2.3:a:squid-cache:squid:3.1.0.17:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.0.18 | cpe:2.3:a:squid-cache:squid:3.1.0.18:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.1 | cpe:2.3:a:squid-cache:squid:3.1.1:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.2 | cpe:2.3:a:squid-cache:squid:3.1.2:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.3 | cpe:2.3:a:squid-cache:squid:3.1.3:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.4 | cpe:2.3:a:squid-cache:squid:3.1.4:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.5 | cpe:2.3:a:squid-cache:squid:3.1.5:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.5.1 | cpe:2.3:a:squid-cache:squid:3.1.5.1:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.6 | cpe:2.3:a:squid-cache:squid:3.1.6:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.7 | cpe:2.3:a:squid-cache:squid:3.1.7:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.8 | cpe:2.3:a:squid-cache:squid:3.1.8:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.9 | cpe:2.3:a:squid-cache:squid:3.1.9:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.10 | cpe:2.3:a:squid-cache:squid:3.1.10:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.11 | cpe:2.3:a:squid-cache:squid:3.1.11:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.12 | cpe:2.3:a:squid-cache:squid:3.1.12:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.12.1 | cpe:2.3:a:squid-cache:squid:3.1.12.1:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.12.2 | cpe:2.3:a:squid-cache:squid:3.1.12.2:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.12.3 | cpe:2.3:a:squid-cache:squid:3.1.12.3:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.13 | cpe:2.3:a:squid-cache:squid:3.1.13:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.14 | cpe:2.3:a:squid-cache:squid:3.1.14:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.15 | cpe:2.3:a:squid-cache:squid:3.1.15:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.16 | cpe:2.3:a:squid-cache:squid:3.1.16:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.17 | cpe:2.3:a:squid-cache:squid:3.1.17:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.18 | cpe:2.3:a:squid-cache:squid:3.1.18:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.19 | cpe:2.3:a:squid-cache:squid:3.1.19:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.20 | cpe:2.3:a:squid-cache:squid:3.1.20:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.21 | cpe:2.3:a:squid-cache:squid:3.1.21:*:*:*:*:*:*:* |
| squid-cache | squid | 3.1.22 | cpe:2.3:a:squid-cache:squid:3.1.22:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.1 | cpe:2.3:a:squid-cache:squid:3.2.0.1:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.2 | cpe:2.3:a:squid-cache:squid:3.2.0.2:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.3 | cpe:2.3:a:squid-cache:squid:3.2.0.3:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.4 | cpe:2.3:a:squid-cache:squid:3.2.0.4:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.5 | cpe:2.3:a:squid-cache:squid:3.2.0.5:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.6 | cpe:2.3:a:squid-cache:squid:3.2.0.6:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.7 | cpe:2.3:a:squid-cache:squid:3.2.0.7:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.8 | cpe:2.3:a:squid-cache:squid:3.2.0.8:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.9 | cpe:2.3:a:squid-cache:squid:3.2.0.9:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.10 | cpe:2.3:a:squid-cache:squid:3.2.0.10:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.11 | cpe:2.3:a:squid-cache:squid:3.2.0.11:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.12 | cpe:2.3:a:squid-cache:squid:3.2.0.12:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.13 | cpe:2.3:a:squid-cache:squid:3.2.0.13:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.14 | cpe:2.3:a:squid-cache:squid:3.2.0.14:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.15 | cpe:2.3:a:squid-cache:squid:3.2.0.15:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.16 | cpe:2.3:a:squid-cache:squid:3.2.0.16:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.17 | cpe:2.3:a:squid-cache:squid:3.2.0.17:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.18 | cpe:2.3:a:squid-cache:squid:3.2.0.18:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.0.19 | cpe:2.3:a:squid-cache:squid:3.2.0.19:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.1 | cpe:2.3:a:squid-cache:squid:3.2.1:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.2 | cpe:2.3:a:squid-cache:squid:3.2.2:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.3 | cpe:2.3:a:squid-cache:squid:3.2.3:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.4 | cpe:2.3:a:squid-cache:squid:3.2.4:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.5 | cpe:2.3:a:squid-cache:squid:3.2.5:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.6 | cpe:2.3:a:squid-cache:squid:3.2.6:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.7 | cpe:2.3:a:squid-cache:squid:3.2.7:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.8 | cpe:2.3:a:squid-cache:squid:3.2.8:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.9 | cpe:2.3:a:squid-cache:squid:3.2.9:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.10 | cpe:2.3:a:squid-cache:squid:3.2.10:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.11 | cpe:2.3:a:squid-cache:squid:3.2.11:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.12 | cpe:2.3:a:squid-cache:squid:3.2.12:*:*:*:*:*:*:* |
| squid-cache | squid | 3.2.13 | cpe:2.3:a:squid-cache:squid:3.2.13:*:*:*:*:*:*:* |
| squid-cache | squid | 3.3.0 | cpe:2.3:a:squid-cache:squid:3.3.0:*:*:*:*:*:*:* |
| squid-cache | squid | 3.3.0.1 | cpe:2.3:a:squid-cache:squid:3.3.0.1:*:*:*:*:*:*:* |