PatchSiren cyber security CVE debrief
CVE-2026-51380 Tenda CVE debrief
A Buffer Overflow vulnerability exists in Tenda AC10 v3 (firmware V03.03.16.09). The vulnerability is located in the /cgi-bin/UploadCfg endpoint and could allow attackers to cause a permanent Denial of Service (DoS) or potentially execute remote code. The CVSS score for this vulnerability is 9.8, indicating a Critical severity level. This vulnerability can be exploited by attackers to disrupt the service or potentially gain remote code execution capabilities, which could lead to further malicious activities. Security teams should assess the impact of this vulnerability on their networks and take immediate action to mitigate the risk.
- Vendor
- Tenda
- Product
- AC10 v3
- CVSS
- CRITICAL 9.8
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-15
- Original CVE updated
- 2026-07-16
- Advisory published
- 2026-07-15
- Advisory updated
- 2026-07-16
Who should care
Security teams and administrators responsible for Tenda AC10 v3 devices, especially those using firmware V03.03.16.09, should be aware of this vulnerability and take immediate action to mitigate the risk. Additionally, network administrators, IT teams, and cybersecurity professionals should review the affected systems and networks to assess the potential impact and implement necessary controls to prevent exploitation.
Technical summary
The CVE-2026-51380 vulnerability is a Buffer Overflow issue in the /cgi-bin/UploadCfg endpoint of Tenda AC10 v3 (firmware V03.03.16.09). This vulnerability has a CVSS score of 9.8 and is classified as Critical. The vulnerability could allow attackers to cause a permanent Denial of Service (DoS) or potentially execute remote code. The buffer overflow occurs when the endpoint receives a specially crafted request that exceeds the buffer size, allowing an attacker to inject malicious code. This could lead to a complete compromise of the affected system.
Defensive priority
High
Recommended defensive actions
- Apply the vendor's official patch or update to a version that addresses this vulnerability.
- Implement network segmentation to limit the attack surface.
- Monitor network traffic for suspicious activity related to the /cgi-bin/UploadCfg endpoint.
- Consider using a Web Application Firewall (WAF) to detect and prevent buffer overflow attacks.
- Review compensating controls for exposed systems while remediation is scheduled and verified.
- Track exceptions, retest remediated assets, and close the item only after evidence is documented.
- Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
Evidence notes
The CVE record was published on 2026-07-15T21:16:54.437Z and was last modified on 2026-07-16T16:19:12.127Z. The NVD entry is currently Deferred. The vulnerability details are based on the information provided in the CVE record and the NVD database. The evidence for this vulnerability is limited to the information provided by the CVE and NVD sources. Further verification and review of the affected systems and networks are necessary to confirm the existence and impact of this vulnerability.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-15T21:16:54.437Z and has not been modified since then. The NVD entry is currently Deferred.