PatchTheCVECVE-2021-36158: In the xrdp package (in branches through 3.14) for Alpine Linux, RDP sessions are vulnerable to man-in-the-mid
CVE-2021-36158 is a medium-severity flaw (CVSS 5.9) affecting aports. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
In the xrdp package (in branches through 3.14) for Alpine Linux, RDP sessions are vulnerable to man-in-the-middle attacks because pre-generated RSA certificates and private keys are used.
Why this priority
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.9 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 72%) |
| CISA exploited list | No |
| Weakness | CWE-312 |
| Published | 2021-07-05 |
| 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-2021-36158?
aports: upgrade to newer than 3.14. Exact commands for each OS are on this page.
Is CVE-2021-36158 being exploited?
CVE-2021-36158 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-2021-36158 affect?
CVE-2021-36158 affects aports. Severity is medium (CVSS 5.9). In the xrdp package (in branches through 3.14) for Alpine Linux, RDP sessions are vulnerable to man-in-the-middle attacks because pre-generated RSA certificates and private keys are used.
How urgent is CVE-2021-36158?
Priority 38/100. Remotely exploitable, no login, no user action; On your watchlist