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Vulnerability record · CVE-2001-1496 · published 31 December 2001

CVE-2001-1496: Acme thttpd vulnerability

Acme · Thttpd

Off-by-one buffer overflow in Basic Authentication in Acme Labs thttpd 1.95 through 2.20 allows remote attackers to cause a denial of service and possibly execute arbitrary code.

9.8 CVSS 3.1 Critical EPSS 4.8% · top 8.3% CWE-193 · CWE-193
9.8CVSS 3.1 base score, v2 7.5
4.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
16 Jun 2026Last modified by NVD

Description

Off-by-one buffer overflow in Basic Authentication in Acme Labs thttpd 1.95 through 2.20 allows remote attackers to cause a denial of service and possibly execute arbitrary code.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/archive/1/241310 Broken LinkThird Party AdvisoryVDB Entry
http://www.securityfocus.com/archive/1/241953 Broken LinkThird Party AdvisoryVDB Entry
http://www.securityfocus.com/bid/3562 Broken LinkThird Party AdvisoryVDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/7595 Third Party AdvisoryVDB Entry
http://www.securityfocus.com/archive/1/241310 Broken LinkThird Party AdvisoryVDB Entry
http://www.securityfocus.com/archive/1/241953 Broken LinkThird Party AdvisoryVDB Entry
http://www.securityfocus.com/bid/3562 Broken LinkThird Party AdvisoryVDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/7595 Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2007-0158Acme thttpd out-of-bounds write vulnerabilitythttpd 2007 has buffer underflow.EPSS 1.3%9.8CVE-2017-17663Acme mini httpd memory buffer overflow vulnerabilityThe htpasswd implementation of mini_httpd before v1.28 and of thttpd before v2.28 is affected by a buffer overflow that can be exploited remotely to …EPSS 2.7%9.8CVE-2009-4491Acme thttpd improper input validation vulnerabilitythttpd 2.25b0 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, o…EPSS 14%9.8CVE-2003-0899Acme thttpd vulnerabilityBuffer overflow in defang in libhttpd.c for thttpd 2.21 to 2.23b1 allows remote attackers to execute arbitrary code via requests that contain '<' or …EPSS 22%5.5CVE-2012-5640Acme thttpd null pointer dereference vulnerabilitythttpd has a local DoS vulnerability via specially-crafted .htpasswd filesEPSS 0.39%5.0CVE-2001-0892Acme thttpd exposure of resource to wrong sphere vulnerabilityAcme Thttpd Secure Webserver before 2.22, with the chroot option enabled, allows remote attackers to view sensitive files under the document root (su…EPSS 1.9%2.1CVE-2013-0348Open source development team sthttpd permissions and access controls vulnerabilitythttpd.c in sthttpd before 2.26.4-r2 and thttpd 2.25b use world-readable permissions for /var/log/thttpd.log, which allows local users to obtain sens…EPSS 0.52%7.8CVE-2021-3156Sudo off-by-one heap overflow allows root privilege escalationSudo before 1.9.5p2 contains an off-by-one error leading to a heap-based buffer overflow. Triggering it via 'sudoedit -s' with a command-line argumen…KEVEPSS 100%analysed

Source: NIST National Vulnerability Database (record CVE-2001-1496), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.