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Vulnerability details: VCID-dkh8-574k-5fap
Vulnerability ID VCID-dkh8-574k-5fap
Aliases CVE-2022-41556
Summary A resource leak in gw_backend.c in lighttpd 1.4.56 through 1.4.66 could lead to a denial of service (connection-slot exhaustion) after a large amount of anomalous TCP behavior by clients. It is related to RDHUP mishandling in certain HTTP/1.1 chunked situations. Use of mod_fastcgi is, for example, affected. This is fixed in 1.4.67.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-401 Missing Release of Memory after Effective Lifetime
System Score Found at
epss 0.00273 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00273 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00273 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
epss 0.00292 https://api.first.org/data/v1/epss?cve=CVE-2022-41556
cvssv3.1 5.9 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2022-41556
archlinux Unknown https://security.archlinux.org/AVG-2822
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2022-41556
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-37797
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41556
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/lighttpd/lighttpd1.4/compare/lighttpd-1.4.66...lighttpd-1.4.67
https://github.com/lighttpd/lighttpd1.4/pull/115
https://git.lighttpd.net/lighttpd/lighttpd1.4/commit/b18de6f9264f914f7bf493abd3b6059343548e50
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OVOSBSCMLGCHH2Z74H64ZWVDFJFQTBC2/
https://security.gentoo.org/glsa/202210-12
AVG-2822 https://security.archlinux.org/AVG-2822
cpe:2.3:a:lighttpd:lighttpd:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:lighttpd:lighttpd:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
CVE-2022-41556 https://nvd.nist.gov/vuln/detail/CVE-2022-41556
USN-5903-1 https://usn.ubuntu.com/5903-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2022-41556
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.50518
EPSS Score 0.00273
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:29:55.194108+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.20/main.json 37.0.0