CVE-2023-42799Public exploitNetwork attack vector

Client code execution via unchecked RTSP URL copy

Published Dec 14, 2023 · Updated Oct 8, 2024

Buffer overflow in Moonlight Game Streaming Project moonlight-common-c allows remote attackers to crash clients or execute code via a malicious server. In parseUrlAddrFromRtspUrlString in RtspConnection.c, strcpy copies an arbitrarily long server-supplied RTSP address into the 48-byte urlAddr buffer without a size check. Exploitation requires a user to pair with the malicious host and select a video bitrate of at least 15 Mbps; public-key pinning blocks a man-in-the-middle path.

CVSS severity8.8
High
EPSS probability1.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Buffer overflow in Moonlight Game Streaming Project moonlight-common-c allows remote attackers to crash clients or execute code via a malicious server. In parseUrlAddrFromRtspUrlString in RtspConnection.c, strcpy copies an arbitrarily long server-supplied RTSP address into the 48-byte urlAddr buffer without a size check. Exploitation requires a user to pair with the malicious host and select a video bitrate of at least 15 Mbps; public-key pinning blocks a man-in-the-middle path.

The record

CVE
CVE-2023-42799
Published
Dec 14, 2023
Updated
Oct 8, 2024
Vendor
Moonlight Game Streaming Project
Product
moonlight-common-c
Classifications
CWE-120, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 50c0a51b10ecc5b3415ea78c21d96d679e2288f9, < 02b7742f4d19631024bd766bd2bb76715780004e

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moonlight Game Streaming Project · moonlight-common-cversion=>= 50c0a51b10ecc5b3415ea78c21d96d679e2288f9, < 02b7742f4d19631024bd766bd2bb76715780004e

Published CVSS scores

8.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo