CVE-2023-45318Public exploitNetwork attack vector

Code execution via double-subtracted receive length

Published Feb 20, 2024 · Updated Nov 4, 2025

Heap overflow in uC-HTTP commit 80d4004 and Gecko Platform 4.3.2.0 allows remote attackers to execute code via crafted HTTP requests. HTTPsReq_ProtocolVerParse subtracts skipped protocol-version bytes twice from RxBufLenRem, underflowing the remaining length that HTTPsSock_ConnDataRx passes to Mem_Copy. An unauthenticated network peer can corrupt the receive buffer and redirect execution; sending the trigger can also crash the embedded service.

CVSS severity10.0
Critical
EPSS probability1.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in uC-HTTP commit 80d4004 and Gecko Platform 4.3.2.0 allows remote attackers to execute code via crafted HTTP requests. HTTPsReq_ProtocolVerParse subtracts skipped protocol-version bytes twice from RxBufLenRem, underflowing the remaining length that HTTPsSock_ConnDataRx passes to Mem_Copy. An unauthenticated network peer can corrupt the receive buffer and redirect execution; sending the trigger can also crash the embedded service.

The record

CVE
CVE-2023-45318
Published
Feb 20, 2024
Updated
Nov 4, 2025
Vendor
Sigma Designs
Product
Gecko Platform
Classifications
CWE-122, CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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=4.3.2.0
  2. Affected versionversion=Silicon Labs Gecko Platform 4.3.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sigma Designs · Gecko Platformversion=4.3.2.0; version=Silicon Labs Gecko Platform 4.3.2.0
Weston Embedded Solutions · uC/HTTPversion=git commit 80d4004

Published CVSS scores

10.0Cisco TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
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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