Posts for: #Dos

CVE-2025-49630: Reachable Assertion in Apache mod_proxy_http2 — Discovered While Hunting CVE-2024-38477

2026-03-03

How i discovered the CVE-2025-49630 — a reachable assertion in h2_proxy_util.c that crashes all Apache workers with a single netcat command. Affects Apache 2.4.26 through 2.4.63. Fixed in 2.4.64.

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1-Day Analysis: CVE-2024-38477 — NULL Pointer Dereference in Apache mod_proxy

2025-06-09

#apache #cve #null-pointer #mod_proxy #dos #1-day #patch-diffing

1-day analysis of CVE-2024-38477: a NULL pointer dereference in ap_proxy_determine_connection() when apr_uri_parse() returns success but leaves hostname NULL. Includes patch diff, GDB crash validation, and an honest account of failed exploitation attempts.

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From Cookie Parser to Crash: Root Cause Analysis of CVE-2021-26690

2024-08-29

#apache #cve #null-pointer #mod_session #dos #1-day #patch-diffing

Deep dive into CVE-2021-26690 — a NULL pointer dereference in Apache HTTP Server’s mod_session that allows unauthenticated remote DoS via a crafted Cookie header.

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