PatchTheCVECVE-2012-1577: lib/libc/stdlib/random.c in OpenBSD returns 0 when seeded with 0.
CVE-2012-1577 is a critical-severity flaw (CVSS 9.8) affecting dietlibc, openbsd, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
lib/libc/stdlib/random.c in OpenBSD returns 0 when seeded with 0.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
- On your watchlist
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.6% (top 25%) |
| CISA exploited list | No |
| Weakness | CWE-335 |
| Published | 2019-12-10 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · 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-2012-1577?
dietlibc: mitigate or apply the listed mitigation; openbsd: mitigate or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2012-1577 being exploited?
CVE-2012-1577 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-2012-1577 affect?
CVE-2012-1577 affects dietlibc, openbsd, debian linux. Severity is critical (CVSS 9.8). lib/libc/stdlib/random.c in OpenBSD returns 0 when seeded with 0.
How urgent is CVE-2012-1577?
Priority 63/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist