CVE-2022-30780: Lighttpd 1.4.56 through 1.4.58 allows a remote attacker to cause a denial of service (CPU consumption from stu

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HIGH 7.5REMOTEDOWNGRADE

CVE-2022-30780 is a high-severity flaw (CVSS 7.5) affecting lighttpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	57.2% (top 1%)
CISA exploited list	No
Weakness	CWE-682
Published	2022-06-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lighttpd

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-06-11 15:15 UTCPublished CVE record published
2026-06-17 04:44 UTCUpdated Record last modified

lighttpd lighttpd DOWNGRADE

Affected: 1.4.56 · 1.4.57 · 1.4.58

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.56

1. Check installed version

apt-cache policy lighttpd || rpm -q lighttpd || lighttpd --version

2. No fixed release: DOWNGRADE to a release before 1.4.56 (Debian / Ubuntu)

apt-cache madison lighttpd sudo apt install lighttpd=<VERSION_BEFORE_1.4.56> sudo apt-mark hold lighttpd

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list lighttpd sudo dnf downgrade lighttpd-<VERSION_BEFORE_1.4.56> sudo dnf versionlock add lighttpd

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-30780?

lighttpd: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-30780 being exploited?

CVE-2022-30780 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-30780 affect?

CVE-2022-30780 affects lighttpd. Severity is high (CVSS 7.5). 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 l

How urgent is CVE-2022-30780?

Priority 61/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

lighttpd vulnerabilities

Related CVEs

CVE-2025-12642 CRITICAL 9.1 DOWNGRADE lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing
CVE-2022-41556 HIGH 7.5 UPGRADE MITIGATE A resource leak in gw_backend.c in lighttpd 1.4.56 through 1.4.66 could lead to a denial of service (connectio
CVE-2022-37797 HIGH 7.5 DOWNGRADE MITIGATE In lighttpd 1.4.65, mod_wstunnel does not initialize a handler function pointer if an invalid HTTP request (we
CVE-2019-11072 CRITICAL 9.8 UPGRADE lighttpd before 1.4.54 has a signed integer overflow, which might allow remote attackers to cause a denial of
CVE-2018-19052 HIGH 7.5 UPGRADE DOWNGRADE An issue was discovered in mod_alias_physical_handler in mod_alias.c in lighttpd before 1.4.50

References

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