PatchTheCVECVE-2021-38084: An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5
CVE-2021-38084 is a high-severity flaw (CVSS 8.1) affecting courier mail server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.1 (High) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.4% (top 28%) |
| CISA exploited list | No |
| Weakness | CWE-74 |
| Published | 2021-08-03 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-38084?
courier mail server: upgrade to 1.1.5. Exact commands for each OS are on this page.
Is CVE-2021-38084 being exploited?
CVE-2021-38084 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-38084 affect?
CVE-2021-38084 affects courier mail server. Severity is high (CVSS 8.1). 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.
How urgent is CVE-2021-38084?
Priority 51/100. High severity; Remotely exploitable, no login, no user action