In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.c.
結論預警: CVE-2017-17439 綜合評估為中等風險（60.2/100）：CVSS 技術影響為高級，利用機率（EPSS 3.43%） 強制指令: 梳理受影響資產並納入修補計畫。
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 | 3.78% | 3.43% | -0.36% |
| 2 | 2026-05-31 | 3.99% | 3.78% | -0.21% |
| 3 | 2026-04-05 | — | 3.99% | — |
完整 EPSS 歷史 （共 15 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 |
|---|---|---|---|
alpine
|
— | CVE-2017-17439: 1 source package rows (heimdal); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 0. | https://security.alpinelinux.org/vuln/CVE-2017-17439 |
debian
|
not yet assigned | CVE-2017-17439 not yet assigned priority: Debian including 1 source packages (heimdal), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2017-17439 |
ubuntu
|
medium | CVE-2017-17439 medium priority: Ubuntu including 1 source packages (heimdal), 7 status rows across 7 suites (artful, bionic, cosmic, trusty, upstream, xenial, zesty): not-affected 4, ignored 2, released 1. | https://ubuntu.com/security/CVE-2017-17439 |
| 廠商 | 產品 | 版本 | 原始 CPE |
|---|---|---|---|
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| heimdal_project | heimdal | <= 7.4.0 | cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:* |
| URL | 標籤 |
|---|---|
| http://h5l.org/advisories.html?show=2017-12-08 | |
| http://www.h5l.org/pipermail/heimdal-announce/2017-December/000008.html | |
| http://www.h5l.org/pipermail/heimdal-discuss/2017-August/000259.html | Third Party Advisory |
| https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878144 | Issue Tracking Mailing List Third Party Advisory |
| https://github.com/heimdal/heimdal/commit/1a6a6e462dc2ac6111f9e02c6852ddec4849b887 | Third Party Advisory |
| https://github.com/heimdal/heimdal/issues/353 | Patch Third Party Advisory |
| https://www.debian.org/security/2017/dsa-4055 | Third Party Advisory |