{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47854 exists.","fix":"No fix has been published for CVE-2021-47854 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-47854 is a high-severity memory corruption vulnerability in embeDD GmbH DD-WRT, published on 21 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-47854 and fix it if it is affected.\n\nWhat it is: CVE-2021-47854 is a high-severity memory corruption vulnerability in embeDD GmbH DD-WRT, published on 21 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47854 exists.\n\nAffected product: embeDD GmbH DD-WRT. 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-2021-47854/ (Markdown: https://insights.sbomify.com/CVE-2021-47854/index.md)","id":"CVE-2021-47854","markdown":"https://insights.sbomify.com/CVE-2021-47854/index.md","name":"CVE-2021-47854","record":{"aliases":["GHSA-fmvf-xj4m-jpwf"],"analysis":{"component_type":"network_device","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"DD-WRT router firmware","requires_auth":"none","summary":"Remote attackers can execute arbitrary code on DD-WRT routers by sending crafted M-SEARCH packets to the UPNP service.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-120","name":"Buffer Copy without Checking Size of Input"}],"description":"DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device.","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":"DD-WRT 45723 - UPNP Buffer Overflow","id":"CVE-2021-47854","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2021"},"n_packages":0,"n_references":5,"next":{"headline":"Openlitespeed 1.7.9 - 'Notes' Stored Cross-Site Scripting","id":"CVE-2021-47855"},"packages":[],"prev":{"headline":"phpPgAdmin contains a remote command execution vulnerability","id":"CVE-2021-47853"},"products":["DD-WRT"],"published":"2026-01-21","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-07-28","vendors":["embeDD GmbH"]},"summary":"Remote attackers can execute arbitrary code on DD-WRT routers by sending crafted M-SEARCH packets to the UPNP service.","url":"https://insights.sbomify.com/CVE-2021-47854/"}