{"answers":{"affected":"It affects 1 product.","exploited":"Yes. Attackers have exploited CVE-2021-31755 in the wild since at least 3 Nov 2021.","fix":"No fix has been published for CVE-2021-31755 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.","what":"CVE-2021-31755 is a critical memory corruption vulnerability in n/a, published on 7 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-31755 and fix it if it is affected.\n\nWhat it is: CVE-2021-31755 is a critical memory corruption vulnerability in n/a, published on 7 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: Yes. Attackers have exploited CVE-2021-31755 in the wild since at least 3 Nov 2021.\n\nAffected product: n/a. 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-2021-31755/ (Markdown: https://insights.sbomify.com/CVE-2021-31755/index.md)","id":"CVE-2021-31755","markdown":"https://insights.sbomify.com/CVE-2021-31755/index.md","name":"CVE-2021-31755","record":{"aliases":["GHSA-539c-2w6v-9rwx"],"analysis":{"component_type":"iot_embedded","fix_type":"no_fix_stated","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Tenda AC11 router","requires_auth":"none","summary":"Attackers can execute arbitrary code on Tenda AC11 routers via a stack buffer overflow in the setmac endpoint.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"ac11_firmware","vendor":"tenda"}],"cvss":{"score":9.8,"severity":"critical","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow vulnerability in /goform/setmac allows attackers to execute arbitrary code on the system via a crafted post request.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":1,"refs":[{"date":null,"kind":"nuclei","ref":"http/cves/2021/CVE-2021-31755.yaml","stars":null,"title":"Tenda Router AC11 - Remote Command Injection"}],"tier":"exploited"},"has_fix":null,"headline":"Tenda AC11 Router Stack Buffer Overflow","id":"CVE-2021-31755","indexable":true,"kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","knownRansomwareCampaignUse":"Unknown","product":"AC11 Router","requiredAction":"Apply updates per vendor instructions.","vendorProject":"Tenda","vulnerabilityName":"Tenda AC11 Router Stack Buffer Overflow Vulnerability"},"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Memory corruption in n/a","id":"CVE-2021-31756"},"packages":[],"prev":{"headline":"Security feature bypass in n/a","id":"CVE-2021-31747"},"products":["n/a"],"published":"2021-05-07","related":[{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2021-46262","kev_date_added":null,"published":"2022-02-15"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2021-46263","kev_date_added":null,"published":"2022-02-15"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2021-46264","kev_date_added":null,"published":"2022-02-15"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2021-46265","kev_date_added":null,"published":"2022-02-15"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2021-46321","kev_date_added":null,"published":"2022-02-15"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2021-31756","kev_date_added":null,"published":"2021-05-07"}],"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":"open","licence":"CC0 1.0","name":"CISA KEV"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"attribution","licence":"MIT","name":"Nuclei templates"}],"ssvc":{"automatable":"yes","exploitation":"active","technical_impact":"total"},"state":"PUBLISHED","updated":"2025-10-21","vendors":["n/a"]},"summary":"Attackers can execute arbitrary code on Tenda AC11 routers via a stack buffer overflow in the setmac endpoint.","url":"https://insights.sbomify.com/CVE-2021-31755/"}