Skip to main content
Live Webinar with SANS (June 25)— Agentic CTI Automation for Fun & ProfitRegister Free
Mallory
CriticalPublic exploit

Signed Integer Overflow in lighttpd burl_normalize_2F_to_slash_fix

IdentifiersCVE-2019-11072CWE-190· Integer Overflow or Wraparound

A signed integer overflow exists in lighttpd before 1.4.54, specifically in the function burl_normalize_2F_to_slash_fix in burl.c. This can be triggered by a crafted HTTP GET request (e.g., /%2F?), but only when a new feature introduced in 1.4.50 is explicitly enabled in the configuration. The overflow leads to an explicit abort() call, causing the application to exit.

Share:
For your environment

Are you exposed to this one?

Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.

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.

The vulnerability allows remote attackers to cause a denial of service by crashing the lighttpd process. There is no evidence of further exploitation beyond application termination, as the abort() is explicitly triggered by the application upon detecting the overflow or memory allocation failure.

Mitigation

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

Ensure the vulnerable feature is not enabled in the lighttpd configuration file (lighttpd.conf) if running a version prior to 1.4.54. Monitor for abnormal process exits and restrict access to the server where possible.

Remediation

Patch, then assume compromise.

Upgrade to lighttpd version 1.4.54 or later, where the issue is resolved. Alternatively, do not enable the affected feature in the configuration if running a vulnerable version.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

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
LighttpdLighttpdapplication

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

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.
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

Community discussion across Reddit, Mastodon, and other social sources.