CVE-2021-47775
Published: 15 January 2026
Summary
CVE-2021-47775 is a high-severity Out-of-bounds Write (CWE-787) vulnerability in Litexmedia (inferred from references). Its CVSS base score is 8.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 4.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 CM-11 (User-installed Software) and SI-16 (Memory Protection).
Deeper analysis
CVE-2021-47775 is a buffer overflow vulnerability (CWE-787) in YouTube Video Grabber, now referred to as YouTube Downloader version 1.9.9.1. The issue enables attackers to execute arbitrary code by overwriting the Structured Exception Handler (SEH), as detailed in the CVE description published on 2026-01-15.
The vulnerability has a CVSS v3.1 base score of 8.4 (AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating it requires local access but low attack complexity, no privileges, and no user interaction. A local attacker can craft a malicious payload of 712 bytes using SEH manipulation to trigger a bind shell connection on a specified local port, achieving arbitrary code execution with high impacts to confidentiality, integrity, and availability.
References include an exploit at https://www.exploit-db.com/exploits/50471 and the software site at https://www.litexmedia.com/youtube-grabber/. No mitigation or patch details are specified in the provided CVE information.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-2763
Vulnerability details
YouTube Video Grabber, now referred to as YouTube Downloader, 1.9.9.1 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting the Structured Exception Handler. Attackers can craft a malicious payload of 712 bytes with SEH manipulation…
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to trigger a bind shell connection on a specified local port.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Local buffer overflow with SEH overwrite directly enables client-side arbitrary code execution via crafted input to the vulnerable application.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Implements memory safeguards like DEP and ASLR that directly prevent exploitation of buffer overflows via SEH overwrite for arbitrary code execution.
Requires identification, prioritization, and remediation of flaws like this buffer overflow vulnerability through patching or removal of the affected software.
Prohibits installation of unapproved user-installed software such as the vulnerable YouTube Downloader, preventing deployment of the exploitable application.