CVE-2024-0263: A vulnerability was found in ACME Ultra Mini HTTPd 1.21

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MEDIUM 5.3REMOTEDOWNGRADE

CVE-2024-0263 is a medium-severity flaw (CVSS 5.3) affecting ultra mini httpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in ACME Ultra Mini HTTPd 1.21. It has been classified as problematic. This affects an unknown part of the component HTTP GET Request Handler. The manipulation leads to denial of service. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-249819.

Why this priority

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	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-404
Published	2024-01-07
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: acme

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

Am I affected?

Timeline

2024-01-07 04:15 UTCPublished CVE record published
2026-06-17 06:53 UTCUpdated Record last modified

acme ultra mini httpd DOWNGRADE

Affected: 1.21

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.21

1. Check installed version

apt-cache policy ultra-mini-httpd || rpm -q ultra-mini-httpd || ultra-mini-httpd --version

2. No fixed release: DOWNGRADE to a release before 1.21 (Debian / Ubuntu)

apt-cache madison ultra-mini-httpd sudo apt install ultra-mini-httpd=<VERSION_BEFORE_1.21> sudo apt-mark hold ultra-mini-httpd

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

dnf --showduplicates list ultra-mini-httpd sudo dnf downgrade ultra-mini-httpd-<VERSION_BEFORE_1.21> sudo dnf versionlock add ultra-mini-httpd

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-2024-0263?

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

Is CVE-2024-0263 being exploited?

CVE-2024-0263 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-2024-0263 affect?

CVE-2024-0263 affects ultra mini httpd. Severity is medium (CVSS 5.3). A vulnerability was found in ACME Ultra Mini HTTPd 1.21. It has been classified as problematic. This affects an unknown part of the component HTTP GET Request Handler. The manipulation leads to denial of service. It is possible to initiate

How urgent is CVE-2024-0263?

Priority 47/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Apache HTTP Server vulnerabilities

References

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