How severe is CVE-2012-5640?

CVE-2012-5640 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2012-5640 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-5640?

CVE-2012-5640 affects Acme Thttpd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2012-5640?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2012-5640 published?

CVE-2012-5640 was published on 2019-11-25 and last updated on 2026-06-16.

CVE-2012-5640

CVE-2012-5640 is a medium-severity vulnerability in Acme Thttpd with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Acme Thttpd
Published: 2019-11-25
Last modified: 2026-06-16

Description

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

Frequently asked questions

What is CVE-2012-5640?: thttpd has a local DoS vulnerability via specially-crafted .htpasswd files
How severe is CVE-2012-5640?: CVE-2012-5640 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2012-5640 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-5640?: CVE-2012-5640 affects Acme Thttpd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2012-5640?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-5640 published?: CVE-2012-5640 was published on 2019-11-25 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:acme:thttpd:-:*:*:*:*:*:*:*

More vulnerabilities in Acme Thttpd

CVE-2007-0158 — Critical (CVSS 9.8): thttpd 2007 has buffer underflow.
CVE-2017-17663 — Critical (CVSS 9.8): The htpasswd implementation of mini_httpd before v1.28 and of thttpd before v2.28 is affected by a buffer overflow that…
CVE-2009-4491 — Critical (CVSS 9.8): thttpd 2.25b0 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers…
CVE-2003-0899 — Critical (CVSS 9.8): Buffer overflow in defang in libhttpd.c for thttpd 2.21 to 2.23b1 allows remote attackers to execute arbitrary code via…
CVE-2001-1496 — Critical (CVSS 9.8): Off-by-one buffer overflow in Basic Authentication in Acme Labs thttpd 1.95 through 2.20 allows remote attackers to…
CVE-2001-0892 — Medium (CVSS 5.0): Acme Thttpd Secure Webserver before 2.22, with the chroot option enabled, allows remote attackers to view sensitive…

All CVEs affecting Acme Thttpd →

Other CWE-476 (NULL Pointer Dereference) vulnerabilities

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CVE-2020-14500 — Critical (CVSS 10.0): Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
CVE-2026-31436 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →