CVE-2021-20852
Description
Buffer overflow in ELECOM WRH-733GBK/GWH routers allows authenticated admin to execute arbitrary OS commands.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Buffer overflow in ELECOM WRH-733GBK/GWH routers allows authenticated admin to execute arbitrary OS commands.
Vulnerability
Buffer overflow vulnerability in ELECOM LAN routers WRH-733GBK and WRH-733GWH with firmware v1.02.9 and prior. The overflow occurs via unspecified vectors, allowing an attacker to corrupt memory.
Exploitation
An attacker must be network-adjacent and possess administrator privileges. The exact sequence of steps is not disclosed, but the buffer overflow can be triggered through unspecified vectors.
Impact
Successful exploitation allows the attacker to execute arbitrary OS commands with elevated privileges, leading to full compromise of the router's confidentiality, integrity, and availability.
Mitigation
Update firmware to a version later than v1.02.9. ELECOM has released patches; refer to the vendor advisory [1]. No workaround is available.
AI Insight generated on May 27, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
2- Range: <=1.02.9
- ELECOM CO.,LTD./ELECOM LAN routersv5Range: WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior
Patches
0No patches discovered yet.
Vulnerability mechanics
No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.
References
2- jvn.jp/en/jp/JVN88993473/index.htmlmitrex_refsource_MISC
- www.elecom.co.jp/news/security/20211130-01/mitrex_refsource_MISC
News mentions
0No linked articles in our index yet.