CVE-2022-30780

HIGH

lighttpd 1.4.56-1.4.58 - Denial of Service via Large Header Processing

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2022-30780. PoCs published by p0dalirius, xiw1ll.

AI-analyzed exploit summary This repository contains a Python script that exploits CVE-2022-30780, a denial-of-service vulnerability in lighttpd. The exploit performs a dichotomic search to determine the maximum URL length and then floods the server with requests exceeding this length to trigger a DoS.

Description

Lighttpd 1.4.56 through 1.4.58 allows a remote attacker to cause a denial of service (CPU consumption from stuck connections) because connection_read_header_more in connections.c has a typo that disrupts use of multiple read operations on large headers.

Exploits (2)

nomisec WORKING POC 17 stars
by p0dalirius · poc
https://github.com/p0dalirius/CVE-2022-30780-lighttpd-denial-of-service

This repository contains a Python script that exploits CVE-2022-30780, a denial-of-service vulnerability in lighttpd. The exploit performs a dichotomic search to determine the maximum URL length and then floods the server with requests exceeding this length to trigger a DoS.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: lighttpd versions 1.3.11 to 1.3.15
No auth needed
Prerequisites: Network access to the target lighttpd server
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec SCANNER
by xiw1ll · poc
https://github.com/xiw1ll/CVE-2022-30780_Checker

This repository contains a Python script that checks if a target Lighttpd server is vulnerable to CVE-2022-30780, a denial-of-service vulnerability affecting versions 1.4.56 through 1.4.58. The script sends an HTTP request to the target and checks the Server header to determine the version.

Classification
Scanner 100%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Lighttpd 1.4.56, 1.4.57, 1.4.58
No auth needed
Prerequisites: Network access to the target Lighttpd server
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Product, Third Party Advisory x_refsource_misc
https://github.com/lighttpd/lighttpd1.4
Issue Tracking, Patch, Vendor Advisory x_refsource_misc
https://redmine.lighttpd.net/issues/3059
Exploit, Third Party Advisory x_refsource_misc
https://podalirius.net/en/cves/2022-30780/
Exploit, Third Party Advisory x_refsource_misc
https://github.com/p0dalirius/CVE-2022-30780-lighttpd-denial-of-service

Scores

CVSS v3 7.5
EPSS 0.5642
EPSS Percentile 98.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-682
Status published
Products (3)
lighttpd/lighttpd 1.4.56
lighttpd/lighttpd 1.4.57
lighttpd/lighttpd 1.4.58
Published Jun 11, 2022
Tracked Since Feb 18, 2026