CVE-2023-25181Public exploitNetwork attack vector

Remote code execution via HTTP length underflow

Published Nov 14, 2023 · Updated Aug 2, 2024

Heap-based buffer overflow in uC-HTTP 3.01.01 allows remote attackers to execute arbitrary code via a crafted HTTP request. HTTPsReq_ProtocolVerParse skips leading non-graphical bytes but searches for CRLF with the original length, underflowing RxBufLenRem; HTTPsSock_ConnDataRx then uses that value for Mem_Copy and the next socket receive. The HTTP server must be enabled and reachable; unauthenticated network traffic can overwrite heap memory, crash the service, or redirect execution.

CVSS severity9.0
Critical
EPSS probability1.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in uC-HTTP 3.01.01 allows remote attackers to execute arbitrary code via a crafted HTTP request. HTTPsReq_ProtocolVerParse skips leading non-graphical bytes but searches for CRLF with the original length, underflowing RxBufLenRem; HTTPsSock_ConnDataRx then uses that value for Mem_Copy and the next socket receive. The HTTP server must be enabled and reachable; unauthenticated network traffic can overwrite heap memory, crash the service, or redirect execution.

The record

CVE
CVE-2023-25181
Published
Nov 14, 2023
Updated
Aug 2, 2024
Vendor
Sigma Designs
Product
Gecko Platform
Classifications
CWE-787, CWE-122, CAPEC-92, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=4.3.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sigma Designs · Gecko Platformversion=4.3.1.0
Silicon Laboratories · Gecko SDKversion=4.3.1
Weston Embedded Solutions · uC/HTTPversion=3.01.01; version=v3.01.01
Weston Embedded Solutions · Cs/NETversion=3.07.01

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.0Cisco TalosCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
CAPEC-92Forced Integer Overflow
T1190Exploit Public-Facing Application

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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