What is CVE-2012-5640?

CVE-2012-5640 is a medium-severity vulnerability in Acme Thttpd, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2019-11-25.

How severe is CVE-2012-5640?

Medium severity. CVSS v3 base score is 5.5 out of 10.

NULL pointer dereference in Acme Thttpd

CVE-2012-5640

thttpd has a local DoS vulnerability via specially-crafted .htpasswd files

Published 2019-11-25 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (30.1th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Acme Thttpd
Thttpd — versions 2012-12-15

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

security-tracker.debian.org/tracker/CVE-2012-5640 (Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
www.openwall.com/lists/oss-security/2012/12/15/1 (Mailing List, Third Party Advisory)
access.redhat.com/security/cve/cve-2012-5640 (vendor-advisory, Broken Link)

Frequently asked questions

What is CVE-2012-5640?: CVE-2012-5640 is a medium-severity vulnerability in Acme Thttpd, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2019-11-25.
How severe is CVE-2012-5640?: Medium severity. CVSS v3 base score is 5.5 out of 10.