{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1637 exists.","fix":"No fix has been published for CVE-2026-1637 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-1637 is a high-severity memory corruption vulnerability in Tenda AC21, published on 29 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-1637 and fix it if it is affected.\n\nWhat it is: CVE-2026-1637 is a high-severity memory corruption vulnerability in Tenda AC21, published on 29 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1637 exists.\n\nAffected product: Tenda AC21. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-1637/ (Markdown: https://insights.sbomify.com/CVE-2026-1637/index.md)","id":"CVE-2026-1637","markdown":"https://insights.sbomify.com/CVE-2026-1637/index.md","name":"CVE-2026-1637","record":{"aliases":["GHSA-h376-wgw6-6272"],"analysis":{"component_type":"network_device","fix_type":"no_fix_stated","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Tenda AC21 router","requires_auth":"low_privilege","summary":"A stack-based buffer overflow in the Tenda AC21 router allows remote attackers to execute arbitrary code via the AdvSetMacMtuWan interface.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulDB","cpe":[{"product":"ac21_firmware","vendor":"tenda"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-121","name":"Stack-based Buffer Overflow"},{"id":"CWE-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer"}],"description":"A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function fromAdvSetMacMtuWan of the file /goform/AdvSetMacMtuWan. The manipulation leads to stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow","id":"CVE-2026-1637","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"Tenda AC21 mDMZSetCfg command injection","id":"CVE-2026-1638"},"packages":[],"prev":{"headline":"Privilege escalation in Service Bridge","id":"CVE-2026-1636"},"products":["AC21"],"published":"2026-01-29","related":[{"cvss_score":9.3,"headline":"Tenda AC21/AC23 GetParentControlInfo stack-based overflow","id":"CVE-2025-9605","kev_date_added":null,"published":"2025-08-29"},{"cvss_score":8.8,"headline":"Command injection in n/a","id":"CVE-2023-24333","kev_date_added":null,"published":"2024-02-21"},{"cvss_score":8.7,"headline":"Tenda AC21 SetNetControlList formSetQosBand buffer overflow","id":"CVE-2026-4565","kev_date_added":null,"published":"2026-03-23"},{"cvss_score":8.7,"headline":"Tenda AC21 SetIpMacBind stack-based overflow","id":"CVE-2025-13445","kev_date_added":null,"published":"2025-11-20"},{"cvss_score":8.7,"headline":"Tenda AC21 SetSysTimeCfg stack-based overflow","id":"CVE-2025-13446","kev_date_added":null,"published":"2025-11-20"},{"cvss_score":8.7,"headline":"Tenda AC21 SetPptpServerCfg formSetPPTPServer buffer overflow","id":"CVE-2025-12611","kev_date_added":null,"published":"2025-11-03"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-02-23","vendors":["Tenda"]},"summary":"A stack-based buffer overflow in the Tenda AC21 router allows remote attackers to execute arbitrary code via the AdvSetMacMtuWan interface.","url":"https://insights.sbomify.com/CVE-2026-1637/"}