PatchTheCVECVE-2021-38449: Some API functions permit by-design writing or copying data into a given buffer
CVE-2021-38449 is a critical-severity flaw (CVSS 9.8) affecting versiondog. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Some API functions permit by-design writing or copying data into a given buffer. Since the client controls these parameters, an attacker could rewrite the memory in any location of the affected product.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.2% (top 31%) |
| CISA exploited list | No |
| Weakness | CWE-123 |
| Published | 2021-10-22 |
| 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-2021-38449?
versiondog: upgrade to newer than 8.0.0. Exact commands for each OS are on this page.
Is CVE-2021-38449 being exploited?
CVE-2021-38449 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-2021-38449 affect?
CVE-2021-38449 affects versiondog. Severity is critical (CVSS 9.8). Some API functions permit by-design writing or copying data into a given buffer. Since the client controls these parameters, an attacker could rewrite the memory in any location of the affected product.
How urgent is CVE-2021-38449?
Priority 57/100. Critical severity; Remotely exploitable, no login, no user action
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