CVE-2024-0263Public exploitNetwork attack vector

Unauthenticated server crash via oversized GET request

Published Jan 7, 2024 · Updated Sep 4, 2024

Denial of service in Vector Ultra Mini HTTPd 1.21 allows remote attackers to crash the server with an oversized HTTP GET request. The HTTP GET request handler fails to reject an oversized request path and terminates the server while processing it. No authentication or user interaction is required; a single crafted request interrupts service for legitimate clients.

CVSS severity5.3
Medium
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Vector Ultra Mini HTTPd 1.21 allows remote attackers to crash the server with an oversized HTTP GET request. The HTTP GET request handler fails to reject an oversized request path and terminates the server while processing it. No authentication or user interaction is required; a single crafted request interrupts service for legitimate clients.

The record

CVE
CVE-2024-0263
Published
Jan 7, 2024
Updated
Sep 4, 2024
Vendor
Vector
Product
Ultra Mini HTTPd
Classifications
CWE-404, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vector · Ultra Mini HTTPdversion=1.21

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3VulDBCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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