{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-20134 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-20134 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-20134 is a high-severity path traversal vulnerability in Quagga Services on D-Link DIR-2640 Routers, published on 30 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-20134 and fix it if it is affected.\n\nWhat it is: CVE-2021-20134 is a high-severity path traversal vulnerability in Quagga Services on D-Link DIR-2640 Routers, published on 30 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-20134 in the wild and no public exploit code.\n\nAffected product: Quagga Services on D-Link DIR-2640 Routers. 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-2021-20134/ (Markdown: https://insights.sbomify.com/CVE-2021-20134/index.md)","id":"CVE-2021-20134","markdown":"https://insights.sbomify.com/CVE-2021-20134/index.md","name":"CVE-2021-20134","record":{"aliases":["GHSA-v4h7-5mx9-q833"],"analysis":{"component_type":"network_device","fix_type":"upgrade","impacts":["code_execution","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"D-Link router","requires_auth":"high_privilege","summary":"Authenticated attackers can exploit path traversal in Quagga services to overwrite scripts, achieving remote code execution and root access on D-Link DIR-2640 routers.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"tenable","cpe":[{"product":"dir-2640-us_firmware","vendor":"dlink"}],"cvss":{"score":8.4,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"Quagga Services on D-Link DIR-2640 less than or equal to version 1.11B02 are affected by an absolute path traversal vulnerability that allows a remote, authenticated attacker to set an arbitrary file on the router's filesystem as the log file used by either Quagga service (zebra or ripd). Subsequent log messages will be appended to the file, prefixed by a timestamp and some logging metadata. Remote code execution can be achieved by using this vulnerability to append to a shell script on the router's filesystem, and then awaiting or triggering the execution of that script. A remote, unauthenticated root shell can easily be obtained on the device in this fashion.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Path traversal in Quagga Services on D-Link DIR-2640 Routers","id":"CVE-2021-20134","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"path_traversal","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Privilege escalation in Nessus","id":"CVE-2021-20135"},"packages":[],"prev":{"headline":"Path traversal in Quagga Services on D-Link DIR-2640 Routers","id":"CVE-2021-20133"},"products":["Quagga Services on D-Link DIR-2640 Routers"],"published":"2021-12-30","related":[{"cvss_score":8.8,"headline":"Hardcoded credentials in Quagga Services on D-Link DIR-2640 Routers","id":"CVE-2021-20132","kev_date_added":null,"published":"2021-12-30"},{"cvss_score":8.1,"headline":"Hardcoded credentials in n/a","id":"CVE-2021-34203","kev_date_added":null,"published":"2021-06-16"},{"cvss_score":7.8,"headline":"Memory corruption in n/a","id":"CVE-2021-34202","kev_date_added":null,"published":"2021-06-16"},{"cvss_score":7.1,"headline":"Memory corruption in n/a","id":"CVE-2021-34201","kev_date_added":null,"published":"2021-06-16"},{"cvss_score":6.8,"headline":"Hardcoded credentials in n/a","id":"CVE-2021-34204","kev_date_added":null,"published":"2021-06-16"},{"cvss_score":6.1,"headline":"Path traversal in Quagga Services on D-Link DIR-2640 Routers","id":"CVE-2021-20133","kev_date_added":null,"published":"2021-12-30"}],"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["n/a"]},"summary":"Authenticated attackers can exploit path traversal in Quagga services to overwrite scripts, achieving remote code execution and root access on D-Link DIR-2640 routers.","url":"https://insights.sbomify.com/CVE-2021-20134/"}