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Public proof of conceptFix available

CVE-2023-42799

A public proof of concept exists; no exploitation attested.

  • Published2023-12-14
  • WeaknessCWE-120

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Moonlight-common-c contains the core GameStream client code shared between Moonlight clients. Moonlight-common-c is vulnerable to buffer overflow starting in commit 50c0a51b10ecc5b3415ea78c21d96d679e2288f9 due to unmitigated usage of unsafe C functions and improper bounds checking. A malicious game streaming server could exploit a buffer overflow vulnerability to crash a moonlight client, or achieve remote code execution (RCE) on the client (with insufficient exploit mitigations or if mitigations can be bypassed). The bug was addressed in commit 02b7742f4d19631024bd766bd2bb76715780004e.

Timeline

dates in UTC
  1. 2023-12-1417:15CVE publishedNVD

Versions per branch

NVD
Moonlight-stream moonlight
BranchAffectedFixed in
8.x≥ 8.4.0, ≤ 8.5.0no fix published
11.0≥ 10.10, ≤ 11.0no fix published
0.10= 0.10.22no fix published
Moonlight-stream moonlight embedded
BranchAffectedFixed in
2.6= 2.6.0no fix published
Moonlight-stream moonlight switch
BranchAffectedFixed in
0.13≥ 0.13, ≤ 0.13.3no fix published

4 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • moonlight-stream moonlight-common-c
    Affected
    • = >= 50c0a51b10ecc5b3415ea78c21d96d679e2288f9, < 02b7742f4d19631024bd766bd2bb76715780004eno fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-12-14

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2024-02-07
  • CNACVSS 3.18.8known since 2026-10-23
  • NVDCVSS 3.18.8read 2026-10-23
  • CNAweakness (CWE)CWE-120known since 2026-10-23
  • FIRST EPSSEPSS score1.9 %2026-11-08

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2023-12-14
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2023-42799?

Moonlight-common-c contains the core GameStream client code shared between Moonlight clients. Moonlight-common-c is vulnerable to buffer overflow starting in commit 50c0a51b10ecc5b3415ea78c21d96d679e2288f9 due to unmitigated usage of unsafe C functions and improper bounds checking. A malicious game streaming server could exploit a buffer overflow vulnerability to crash a moonlight client, or achieve remote code execution (RCE) on the client (with insufficient exploit mitigations or if mitigations can be bypassed). The bug was addressed in commit 02b7742f4d19631024bd766bd2bb76715780004e.

Is CVE-2023-42799 actively exploited?

A proof-of-concept exploit exists for CVE-2023-42799, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2023-42799?

CVE-2023-42799 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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Sources for this record