CVE-2018-25103

Use-after-free vulnerabilities in lighttpd <= 1.4.50

5.3 MediumFix available

There exists use-after-free vulnerabilities in lighttpd <= 1.4.50 request parsing which might read from invalid pointers to memory used in the same request, not from other requests.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: None

Exploit likelihood

0.66%Up 0.6 points since Jun 18, 2024

What each source reports

CVE List Score used 5.3

Use-after-free vulnerabilities in lighttpd <= 1.4.50

There exists use-after-free vulnerabilities in lighttpd <= 1.4.50 request parsing which might read from invalid pointers to memory used in the same request, not from other requests.

Record: CVE-2018-25103
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

EUVDEUVD-2018-21592 5.3

There exists use-after-free vulnerabilities in lighttpd <= 1.4.50 request parsing which might read from invalid pointers to memory used in the same request, not from other requests.

Record: EUVD-2018-21592
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-844m-hq7r-wxc8 5.3

There exists a use-after-free-vulnerability in lighttpd <= 1.4.50 that can allow access to do a...

There exists a use-after-free-vulnerability in lighttpd <= 1.4.50 that can allow access to do a case-insensitive comparison against the reused pointer.

Record: GHSA-844m-hq7r-wxc8
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

NVD 5.3

There exists use-after-free vulnerabilities in lighttpd <= 1.4.50 request parsing which might read from invalid pointers to memory used in the same request, not from other requests.

Record: CVE-2018-25103
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

OSV 5.3

There exists use-after-free vulnerabilities in lighttpd <= 1.4.50 request parsing which might read from invalid pointers to memory used in the same request, not from other requests.

Record: CVE-2018-25103
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2018-25103 5.3

There exists use-after-free vulnerabilities in lighttpd <= 1.4.50 request parsing which might read from invalid pointers to memory used in the same request, not from other requests.

Record: DEBIAN-CVE-2018-25103
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2018-25103 5.3

There exists use-after-free vulnerabilities in lighttpd <= 1.4.50 request parsing which might read from invalid pointers to memory used in the same request, not from other requests.

Record: UBUNTU-CVE-2018-25103
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

Affected products

lighttpd

Affected packages

Affected packages
Package	Affected	Fixed
`lighttpd` Debian:12	before 1.4.52-1	1.4.52-1
`lighttpd` Debian:13	before 1.4.52-1	1.4.52-1
`lighttpd` Debian:14	before 1.4.52-1	1.4.52-1
`lighttpd` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 1.4.31-3ubuntu31.4.33-1ubuntu11.4.33-1+nmu2ubuntu11.4.33-1+nmu2ubuntu21.4.33-1+nmu2ubuntu2.11.4.33-1+nmu2ubuntu2.1+esm1	None known
`lighttpd` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 1.4.35-4ubuntu11.4.35-4ubuntu21.4.35-4ubuntu2.11.4.35-4ubuntu2.1+esm1	None known
`lighttpd` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 1.4.45-1ubuntu11.4.45-1ubuntu31.4.45-1ubuntu3+esm11.4.45-1ubuntu3.18.041.4.45-1ubuntu3.18.04+esm11.4.45-1ubuntu3.18.04.11.4.45-1ubuntu3.18.04.1+esm1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-25103 is a medium vulnerability (CVSS 5.3) in Lighttpd, published June 17, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.66%, the 51st percentile. Fixed in lighttpd 1.4.52-1.

References

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