CVE-2026-27855
5.9
MEDIUM
CVSS 3.1
EPSS 0.34%
描述
Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM. No publicly available exploits are known.
如何修補 CVE-2026-27855
要修補 CVE-2026-27855,請將受影響套件升級到下列已修補版本。
- —升級至 2.4.3-r0 或更新版本
- —升級至 1:2.3.13+dfsg1-2+deb11u3 或更新版本
CVE-2026-27855 正在被利用嗎?
低 — EPSS 為 0.3%,目前沒有觀察到大規模利用活動。
受影響套件(2)
- from 0, < 2.4.3-r0
- from 0, < 1:2.3.13+dfsg1-2+deb11u3
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |