What is CVE-2011-2900?

CVE-2011-2900 is a vulnerability in Shttpd, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-08-05.

Is CVE-2011-2900 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Shttpd

CVE-2011-2900

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.

Vulnerability class: Buffer Overflow

Published 2011-08-05 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 7.5 (High). Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.133 (96.3th percentile), scored 2026-09-29.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.133 · newest: 0.133 · change: 0.000

Affected products

Shttpd — versions 1.42
Valenok Mongoose — versions 3.0
Yassl Yasslews — versions 0.2

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

lists.fedoraproject.org/pipermail/package-announce/2011-September/065505.html (vendor-advisory)
www.securityfocus.com/bid/48980 (vdb-entry)
code.google.com/p/mongoose/source/detail (Patch)
secunia.com/advisories/45464 (Vendor Advisory, third-party-advisory)
secunia.com/advisories/45902 (third-party-advisory)
lists.fedoraproject.org/pipermail/package-announce/2011-September/065537.html (vendor-advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/68991 (vdb-entry)
www.openwall.com/lists/oss-security/2011/08/03/5 (mailing-list, Patch)
securityreason.com/securityalert/8337 (third-party-advisory)
lists.fedoraproject.org/pipermail/package-announce/2011-September/065273.html (vendor-advisory)

Frequently asked questions

What is CVE-2011-2900?: CVE-2011-2900 is a vulnerability in Shttpd, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-08-05.
Is CVE-2011-2900 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.