CVE-2022-30780

Exp

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.

Published: 2022-06-11 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-30780 is rated High Exploit Risk (81.9/100): CVSS High severity, with high exploitation likelihood (EPSS 81.50%, 99th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.22% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2022-30780

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2022-30780

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-10 79.28% 81.50% +2.22%
2 2026-05-05 81.82% 79.28% -2.54%
3 2026-01-31 — 81.82% —

Full EPSS history (48 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-30780

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2022-30780

OS Trackers for CVE-2022-30780

vendor priority summary link
debian not yet assigned CVE-2022-30780 not yet assigned priority: Debian including 1 source packages (lighttpd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2022-30780
suse high CVE-2022-30780 severity important: SUSE including 1 source package names (lighttpd), 6 product×package rows across 6 product lines (SUSE Linux Enterprise High Availability Extension 12 SP3, SUSE Linux Enterprise High Availability Extension 12 SP4, … (6 product lines)): Known Not Affected 6. https://www.suse.com/security/cve/CVE-2022-30780/
ubuntu medium CVE-2022-30780 medium priority: Ubuntu including 1 source packages (lighttpd), 14 status rows across 14 suites (bionic, focal, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 12, needed 1, released 1. https://ubuntu.com/security/CVE-2022-30780

Affected software / configurations for CVE-2022-30780

Vendor Product Version Raw CPE
lighttpd lighttpd 1.4.56 cpe:2.3:a:lighttpd:lighttpd:1.4.56:*:*:*:*:*:*:*
lighttpd lighttpd 1.4.57 cpe:2.3:a:lighttpd:lighttpd:1.4.57:*:*:*:*:*:*:*
lighttpd lighttpd 1.4.58 cpe:2.3:a:lighttpd:lighttpd:1.4.58:*:*:*:*:*:*:*

References for CVE-2022-30780

URL Tags
https://github.com/lighttpd/lighttpd1.4 Product Third Party Advisory
https://github.com/p0dalirius/CVE-2022-30780-lighttpd-denial-of-service Exploit Third Party Advisory
https://podalirius.net/en/cves/2022-30780/ Exploit Third Party Advisory
https://redmine.lighttpd.net/issues/3059 Issue Tracking Patch Vendor Advisory
cvelogic Threat Intelligence