{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-27862 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-27862 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-27862 is a medium-severity vulnerability in IEEE 802.2, published on 27 Sep 2022. 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-2021-27862 and fix it if it is affected.\n\nWhat it is: CVE-2021-27862 is a medium-severity vulnerability in IEEE 802.2, published on 27 Sep 2022. 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-2021-27862 in the wild and no public exploit code.\n\nAffected product: IEEE 802.2. 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-2021-27862/ (Markdown: https://insights.sbomify.com/CVE-2021-27862/index.md)","id":"CVE-2021-27862","markdown":"https://insights.sbomify.com/CVE-2021-27862/index.md","name":"CVE-2021-27862","record":{"aliases":["GHSA-4fhf-8ph3-pp6c"],"analysis":{"component_type":"network_device","fix_type":"no_fix_stated","impacts":["security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Network filtering protocol","requires_auth":"none","summary":"Attackers can bypass Layer 2 network filtering and IPv6 RA guard by crafting specific Ethernet to Wifi frames with invalid LLC/SNAP headers.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"certcc","cpe":[{"product":"ieee_802.2","vendor":"ieee"},{"product":"p802.1q","vendor":"ietf"}],"cvss":{"score":4.7,"severity":"medium","source":"cisa-adp","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-290","name":"Authentication Bypass by Spoofing"},{"id":"CWE-130","name":"Improper Handling of Length Parameter Inconsistency"}],"description":"Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length and Ethernet to Wifi frame conversion (and optionally VLAN0 headers).","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":"Security feature bypass in 802.2","id":"CVE-2021-27862","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2021"},"n_packages":0,"n_references":4,"next":{"headline":"Veritas Backup Exec Agent File Access","id":"CVE-2021-27876"},"packages":[],"prev":{"headline":"L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with invalid lengths","id":"CVE-2021-27861"},"products":["802.2","draft-ietf-v6ops-ra-guard-08"],"published":"2022-09-27","related":[{"cvss_score":4.7,"headline":"L2 network filtering bypass using stacked VLAN0, LLC/SNAP headers, and Ethernet to Wifi frame translation","id":"CVE-2021-27854","kev_date_added":null,"published":"2022-09-27"},{"cvss_score":4.7,"headline":"L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with invalid lengths","id":"CVE-2021-27861","kev_date_added":null,"published":"2022-09-27"}],"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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-11-04","vendors":["IEEE","IETF"]},"summary":"Attackers can bypass Layer 2 network filtering and IPv6 RA guard by crafting specific Ethernet to Wifi frames with invalid LLC/SNAP headers.","url":"https://insights.sbomify.com/CVE-2021-27862/"}