CVE-2023-45318: A heap-based buffer overflow vulnerability exists in the HTTP Server functionality of Weston Embedded uC-HTTP

This week

CRITICAL 10.0REMOTEDOWNGRADEMITIGATE

CVE-2023-45318 is a critical-severity flaw (CVSS 10.0) affecting gecko software development kit, uc-http. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A heap-based buffer overflow vulnerability exists in the HTTP Server functionality of Weston Embedded uC-HTTP git commit 80d4004. A specially crafted network packet can lead to arbitrary code execution. An attacker can send a malicious packet to trigger this vulnerability.

Why this priority

Critical severity
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	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 22%)
CISA exploited list	No
Weakness	CWE-122, CWE-787
Published	2024-02-20
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: silabs · weston-embedded

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

Am I affected?

Timeline

2024-02-20 15:15 UTCPublished CVE record published
2026-06-17 06:28 UTCUpdated Record last modified

silabs gecko software development kit DOWNGRADE

Affected: 4.3.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.3.2.0

1. Check installed version

apt-cache policy gecko-software-development-kit || rpm -q gecko-software-development-kit || gecko-software-development-kit --version

2. No fixed release: DOWNGRADE to a release before 4.3.2.0 (Debian / Ubuntu)

apt-cache madison gecko-software-development-kit sudo apt install gecko-software-development-kit=<VERSION_BEFORE_4.3.2.0> sudo apt-mark hold gecko-software-development-kit

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

dnf --showduplicates list gecko-software-development-kit sudo dnf downgrade gecko-software-development-kit-<VERSION_BEFORE_4.3.2.0> sudo dnf versionlock add gecko-software-development-kit

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.

weston-embedded uc-http MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy uc-http || rpm -q uc-http || uc-http --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2023-45318?

gecko software development kit: downgrade or apply the listed mitigation; uc-http: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-45318 being exploited?

CVE-2023-45318 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-2023-45318 affect?

CVE-2023-45318 affects gecko software development kit, uc-http. Severity is critical (CVSS 10.0). A heap-based buffer overflow vulnerability exists in the HTTP Server functionality of Weston Embedded uC-HTTP git commit 80d4004. A specially crafted network packet can lead to arbitrary code execution. An attacker can send a malicious pack

How urgent is CVE-2023-45318?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Git vulnerabilities

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References

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