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.

Published: 2001-12-31 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2001-1496 is rated High Risk (68.9/100): CVSS Critical severity, with high exploitation likelihood (EPSS 4.84%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2001-1496

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 6.88% 4.84% -2.05%
2 2026-05-16 13.89% 6.88% -7.00%
3 2026-02-20 — 13.89% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2001-1496

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2001-1496

Affected software / configurations for CVE-2001-1496

Vendor Product Version Raw CPE
acme thttpd >= 1.95, <= 2.20 cpe:2.3:a:acme:thttpd:*:*:*:*:*:*:*:*

References for CVE-2001-1496

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