CVE-2026-5550
Published: 05 April 2026
Summary
CVE-2026-5550 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Com (inferred from references). Its CVSS base score is 8.7 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 39.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Deeper analysis
CVE-2026-5550 is a stack-based buffer overflow vulnerability in the fromSysToolChangePwd function within the /bin/httpd component of Tenda AC10 firmware version 16.03.10.10_multi_TDE01. Published on 2026-04-05, the issue allows remote manipulation and may affect multiple endpoints. It carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) and maps to CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow).
Attackers with low privileges can exploit this vulnerability remotely over the network with low complexity and no user interaction required. Successful exploitation enables high-impact consequences, including unauthorized disclosure of information, modification of data, and denial of service, potentially leading to full system compromise through arbitrary code execution via the buffer overflow.
Advisories and further details on mitigation are available in referenced sources, including a GitHub repository at https://github.com/somanyerrors/tenda-ac10v4-vulnerabilities/blob/main/findings/HIGH-01-getvalue-229-callers.md documenting the findings, VulDB entries at https://vuldb.com/submit/782299, https://vuldb.com/vuln/355314, and https://vuldb.com/vuln/355314/cti, as well as the vendor site at https://www.tenda.com.cn/.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-19048
Vulnerability details
A vulnerability was identified in Tenda AC10 16.03.10.10_multi_TDE01. This affects the function fromSysToolChangePwd of the file /bin/httpd. The manipulation leads to stack-based buffer overflow. The attack may be initiated remotely. Multiple endpoints might be affected.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in public-facing httpd web server component allows remote exploitation with low privileges leading to arbitrary code execution and full system compromise.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mandates timely remediation of the stack-based buffer overflow flaw in the Tenda AC10 httpd component to prevent remote exploitation.
Provides memory protections like stack canaries and non-executable stacks to mitigate arbitrary code execution from the buffer overflow in fromSysToolChangePwd.
Enforces input validation on the fromSysToolChangePwd function to restrict operations within memory bounds and block the stack-based buffer overflow.