High

Stack-based Buffer Overflow in Mongoose, yaSSL Embedded Web Server, and Simple HTTPD (shttpd)

IdentifiersCVE-2011-2900CWE-121

A stack-based buffer overflow exists in the put_dir function in mongoose.c (Mongoose 3.0), put_dir in yasslEWS.c (yaSSL Embedded Web Server 0.2), and _shttpd_put_dir in io_dir.c (Simple HTTPD 1.42). The vulnerability is triggered by a crafted HTTP PUT request, allowing remote attackers to overflow a stack buffer and execute arbitrary code. This vulnerability was exploited in the wild in 2011.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows remote attackers to execute arbitrary code with the privileges of the web server process, potentially leading to full system compromise. The vulnerability is remotely exploitable and was observed being exploited in the wild.

Mitigation

If you can’t patch tonight, do this now.

Restrict network access to the affected web server, disable or limit the use of HTTP PUT requests, and use network-level protections such as firewalls or intrusion prevention systems to block malicious requests targeting the vulnerable functionality.

Remediation

Patch, then assume compromise.

Upgrade to a patched version of the affected software (Mongoose, yaSSL Embedded Web Server, or Simple HTTPD) that addresses the buffer overflow in the respective put_dir functions. If no patch is available, consider disabling HTTP PUT requests or restricting access to trusted users only.

PUBLIC EXPLOITS

Exploits

No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.

VALID 0 / 2 TOTALView more in app

All candidate exploits were filtered out by Mallory's validation.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

ShttpdShttpdapplication

ValenokMongooseapplication

YasslYasslewsapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

No public activity tracked yet. Mallory keeps watching.

0 SOURCESView more in app

No public activity observed for this vulnerability.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity