CVE-2023-42799 | Buffer overflow due to use of `strcpy` in `parseUrlAddrFromRtspUrlString`

Exp

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.

Published: 2023-12-14 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-42799 is rated High Exploit Risk (73/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.53%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2023-42799

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-42799

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 1.06% 0.53% -0.53%
2 2025-11-18 0.53% 1.06% +0.53%
3 2025-05-04 — 0.53% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-42799

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]

Weakness enumeration for CVE-2023-42799

Affected software / configurations for CVE-2023-42799

Vendor Product Version Raw CPE
moonlight-stream moonlight-common-c >= 2022-11-04, < 2023-10-06 cpe:2.3:a:moonlight-stream:moonlight-common-c:*:*:*:*:*:*:*:*
moonlight-stream moonlight >= 8.4.0, <= 8.5.0 cpe:2.3:a:moonlight-stream:moonlight:*:*:*:*:*:iphone_os:*:*
moonlight-stream moonlight >= 8.4.0, <= 8.5.0 cpe:2.3:a:moonlight-stream:moonlight:*:*:*:*:*:tvos:*:*
moonlight-stream moonlight >= 10.10, <= 11.0 cpe:2.3:a:moonlight-stream:moonlight:*:*:*:*:*:android:*:*
moonlight-stream moonlight 0.10.22 cpe:2.3:a:moonlight-stream:moonlight:0.10.22:*:*:*:*:chrome:*:*
moonlight-stream moonlight_embedded 2.6.0 cpe:2.3:a:moonlight-stream:moonlight_embedded:2.6.0:*:*:*:*:*:*:*
moonlight-stream moonlight_xbox >= 1.12.0, <= 1.14.40 cpe:2.3:a:moonlight-stream:moonlight_xbox:*:*:*:*:*:*:*:*
moonlight-stream moonlight_tv >= 1.5.4, <= 1.5.27 cpe:2.3:a:moonlight-stream:moonlight_tv:*:*:*:*:*:*:*:*
moonlight-stream moonlight_switch >= 0.13, <= 0.13.3 cpe:2.3:a:moonlight-stream:moonlight_switch:*:*:*:*:*:*:*:*
moonlight-stream moonlight_vita >= 0.9.2, <= 0.9.3 cpe:2.3:a:moonlight-stream:moonlight_vita:*:*:*:*:*:*:*:*

References for CVE-2023-42799

cvelogic Threat Intelligence