CVE-2011-2900

Exp

Stack-based buffer overflow in the (1) put_dir function in mongoose.c in Mongoose 3.0, (2) put_dir function in yasslEWS.c in yaSSL Embedded Web Server (yasslEWS) 0.2, and (3) _shttpd_put_dir function in io_dir.c in Simple HTTPD (shttpd) 1.42 allows remote attackers to execute arbitrary code via an HTTP PUT request, as exploited in the wild in 2011.

Published: 2011-08-05 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-2900 is rated High Exploit Risk (78.5/100): CVSS High severity, with high exploitation likelihood (EPSS 53.67%, 98th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2011-2900

EDB-ID Source Kind Published Link
17669 exploit_db edb 2011-08-15 Exploit-DB ↗
17658 exploit_db edb 2011-08-12 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2011-2900

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 2026-04-14 54.48% 53.67% -0.81%
2 2026-02-04 51.21% 54.48% +3.27%
3 2025-06-26 — 51.21% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-2900

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
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-2011-2900

Affected software / configurations for CVE-2011-2900

Vendor Product Version Raw CPE
shttpd shttpd 1.42 cpe:2.3:a:shttpd:shttpd:1.42:*:*:*:*:*:*:*
valenok mongoose 3.0 cpe:2.3:a:valenok:mongoose:3.0:*:*:*:*:*:*:*
yassl yasslews 0.2 cpe:2.3:a:yassl:yasslews:0.2:*:*:*:*:*:*:*

References for CVE-2011-2900

cvelogic Threat Intelligence