{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-34727 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-34727 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-34727 is a critical memory corruption vulnerability in Cisco IOS XE SD-WAN Software, published on 23 Sep 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-2021-34727 and fix it if it is affected.\n\nWhat it is: CVE-2021-34727 is a critical memory corruption vulnerability in Cisco IOS XE SD-WAN Software, published on 23 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-34727 in the wild and no public exploit code.\n\nAffected product: Cisco IOS XE SD-WAN Software. 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-2021-34727/ (Markdown: https://insights.sbomify.com/CVE-2021-34727/index.md)","id":"CVE-2021-34727","markdown":"https://insights.sbomify.com/CVE-2021-34727/index.md","name":"CVE-2021-34727","record":{"aliases":["GHSA-rxw2-fh82-mfcc"],"analysis":{"component_type":"network_device","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Cisco IOS XE SD-WAN","requires_auth":"none","summary":"Unauthenticated remote attackers can trigger a buffer overflow in Cisco IOS XE SD-WAN devices to execute arbitrary commands with root privileges or cause a denial of service.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"cisco","cpe":[{"product":"ios_xe_sd-wan","vendor":"cisco"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","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-120","name":"Buffer Copy without Checking Size of Input"}],"description":"A vulnerability in the vDaemon process in Cisco IOS XE SD-WAN Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected device. This vulnerability is due to insufficient bounds checking when an affected device processes traffic. An attacker could exploit this vulnerability by sending crafted traffic to the device. A successful exploit could allow the attacker to cause a buffer overflow and possibly execute arbitrary commands with root-level privileges, or cause the device to reload, which could result in a denial of service condition.","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":"Cisco IOS XE SD-WAN Software Buffer Overflow Vulnerability","id":"CVE-2021-34727","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Cisco IOS XR Software Authenticated User Privilege Escalation Vulnerabilities","id":"CVE-2021-34728"},"packages":[],"prev":{"headline":"Cisco SD-WAN Software Command Injection Vulnerability","id":"CVE-2021-34726"},"products":["Cisco IOS XE SD-WAN Software"],"published":"2021-09-23","related":[{"cvss_score":9.8,"headline":"Cisco SD-WAN Solution Software Buffer Overflow Vulnerability","id":"CVE-2020-3375","kev_date_added":null,"published":"2020-07-31"},{"cvss_score":8.8,"headline":"Cisco SD-WAN vManage Authorization Bypass Vulnerabilities","id":"CVE-2021-1305","kev_date_added":null,"published":"2021-01-20"},{"cvss_score":7.8,"headline":"Cisco IOS XE SD-WAN Software Command Injection Vulnerability","id":"CVE-2023-20035","kev_date_added":null,"published":"2023-03-23"},{"cvss_score":6.8,"headline":"Cisco IOS XE SD-WAN Software Authentication Bypass Vulnerability","id":"CVE-2020-3216","kev_date_added":null,"published":"2020-06-03"},{"cvss_score":6.7,"headline":"Cisco IOS XE SD-WAN Software Command Injection Vulnerability","id":"CVE-2021-34725","kev_date_added":null,"published":"2021-09-23"},{"cvss_score":6.6,"headline":"Cisco IOS XE SD-WAN Software Console Privilege Escalation Vulnerability","id":"CVE-2021-1371","kev_date_added":null,"published":"2021-03-24"}],"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":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2024-11-07","vendors":["Cisco"]},"summary":"Unauthenticated remote attackers can trigger a buffer overflow in Cisco IOS XE SD-WAN devices to execute arbitrary commands with root privileges or cause a denial of service.","url":"https://insights.sbomify.com/CVE-2021-34727/"}