Loading vulnerability…
CVE-2023-25950 is an HTTP request/response smuggling vulnerability affecting HAProxy 2.7.0 and versions 2.6.1 through 2.6.7. A remote attacker can manipulate HTTP request handling so that a legitimate user's request is altered, which can result in sensitive-information disclosure or denial of service.
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.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a comprehensive research and exploit demonstration for CVE-2023-25950, a vulnerability in HAProxy 2.7.0's HTTP/3 implementation that allows HTTP request smuggling via malformed header names. The repository includes: - Detailed documentation (README.md, research/release.md) explaining the vulnerability, its root cause in the HAProxy source code, and the impact of the flaw. - Lab setup files (Dockerfiles, docker-compose files, configuration files for HAProxy, Apache, NGINX, Varnish, Squid, Caddy, and a Flask backend) to reproduce the vulnerable environment. - Python scripts (http3_client_2r.py, minimal_http3_client.py) that act as HTTP/3 clients capable of sending crafted requests to exploit the vulnerability. - Example payloads and instructions for triggering the vulnerability and observing the effects (e.g., bypassing ACLs to access /admin on the backend). The exploit works by sending an HTTP/3 request with a malformed header (containing CRLF sequences) to HAProxy, which fails to properly validate the header name and forwards the smuggled request to the backend. This can allow attackers to bypass access controls, access restricted endpoints, or cause denial of service, depending on backend behavior. The repository is operational and provides all necessary components to reproduce and demonstrate the exploit in a controlled lab environment.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
No public activity tracked yet. Mallory keeps watching.
No public activity observed for this vulnerability.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.