Memory corruption via miscalculated MMS packet length
Published Nov 7, 2023 · Updated May 28, 2026
Heap-based buffer overflow in VideoLAN VLC before 3.0.20 allows remote attackers to corrupt memory via a crafted MMS stream. GetPacket subtracts 8 rather than the full 12-byte header from the attacker-controlled packet size, then reads that oversized length at buffer offset 12. VLC must explicitly open an attacker-controlled MMST or MMSH stream; exploitation can crash the player or execute code with the target user's privileges.
Summary
What happened
Heap-based buffer overflow in VideoLAN VLC before 3.0.20 allows remote attackers to corrupt memory via a crafted MMS stream. GetPacket subtracts 8 rather than the full 12-byte header from the attacker-controlled packet size, then reads that oversized length at buffer offset 12. VLC must explicitly open an attacker-controlled MMST or MMSH stream; exploitation can crash the player or execute code with the target user's privileges.
The record
- CVE
- CVE-2023-47359
- Published
- Nov 7, 2023
- Updated
- May 28, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 7, 2023CVE publishedPublication date reported by the CVE source.
- May 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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.
Public exploit references
- MMSH heap-overflow demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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