Vulnerability · Published Aug 3, 2021 · Assigned by mitre
CVE-2021-38084
High 8.1
In plain English
A high-severity security flaw in the courier package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.1High
Exploit odds (30 days)1.4%top 28.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | courier | no fix listed | DEBIAN-CVE-2021-38084 |
| Debian:13 | courier | 1.3.13-1 | DEBIAN-CVE-2021-38084 |
| Debian:14 | courier | 1.3.13-1 | DEBIAN-CVE-2021-38084 |
| Ubuntu:22.04:LTS | courier | no fix listed | UBUNTU-CVE-2021-38084 |
| Ubuntu:25.10 | courier | no fix listed | UBUNTU-CVE-2021-38084 |
| Ubuntu:26.04:LTS | courier | no fix listed | UBUNTU-CVE-2021-38084 |
| Ubuntu:26.10 | courier | no fix listed | UBUNTU-CVE-2021-38084 |