CVE-2001-1496

Name: CVE-2001-1496
Creator: NVD / NIST
Published: 2001-12-31T05:00:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 4.84%

Last modified Jun 16, 2026

CVE-2001-1496 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 4.84% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

4.84%

90.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-193

Affected Software

Vendor	Product	Versions
Acme	Thttpd	>= 1.95, <= 2.20

References

http://www.securityfocus.com/archive/1/241310Broken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/archive/1/241953Broken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/3562Broken Link, Third Party Advisory, VDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/7595Third Party Advisory, VDB Entry
http://www.securityfocus.com/archive/1/241310Broken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/archive/1/241953Broken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/3562Broken Link, Third Party Advisory, VDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/7595Third Party Advisory, VDB Entry

Timeline

Published: Dec 31, 2001
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2001-1496?

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.

How severe is CVE-2001-1496?

CVE-2001-1496 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.84% probability of exploitation in the next 30 days.

How do I fix CVE-2001-1496?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2001-1496?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST