{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47764 exists.","fix":"No fix has been published for CVE-2021-47764 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-47764 is a medium-severity denial of service vulnerability in Celestialsoftware AbsoluteTelnet, published on 15 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-47764 and fix it if it is affected.\n\nWhat it is: CVE-2021-47764 is a medium-severity denial of service vulnerability in Celestialsoftware AbsoluteTelnet, published on 15 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47764 exists.\n\nAffected product: Celestialsoftware AbsoluteTelnet. 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-2021-47764/ (Markdown: https://insights.sbomify.com/CVE-2021-47764/index.md)","id":"CVE-2021-47764","markdown":"https://insights.sbomify.com/CVE-2021-47764/index.md","name":"CVE-2021-47764","record":{"aliases":["GHSA-g9m3-654m-8943"],"analysis":{"component_type":"desktop_application","fix_type":"no_fix_stated","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Telnet client","requires_auth":"none","summary":"Local attackers can crash AbsoluteTelnet by pasting long payloads into DialUp and license fields, causing application termination.","user_interaction":"required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"absolutetelnet","vendor":"celestialsoftware"}],"cvss":{"score":6.7,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"AbsoluteTelnet 11.24 contains a denial of service vulnerability that allows local attackers to crash the application by manipulating DialUp connection and license name fields. Attackers can generate a 1000-character payload and paste it into specific input fields to trigger application crashes and force unexpected termination.","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":"AbsoluteTelnet 11.24 - 'Phone' Denial of Service (PoC)","id":"CVE-2021-47764","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"AbsoluteTelnet 11.24 - 'Username' Denial of Service (PoC)","id":"CVE-2021-47765"},"packages":[],"prev":{"headline":"Aimeos Laravel ecommerce platform 2021.10 LTS - 'sort' SQL injection","id":"CVE-2021-47763"},"products":["AbsoluteTelnet"],"published":"2026-01-15","related":[{"cvss_score":6.9,"headline":"AbsoluteTelnet 11.12 - 'SSH2/username' Denial of Service","id":"CVE-2020-37166","kev_date_added":null,"published":"2026-02-06"},{"cvss_score":6.7,"headline":"AbsoluteTelnet 11.12 - \"license entry\" Denial of Service","id":"CVE-2020-37164","kev_date_added":null,"published":"2026-02-06"},{"cvss_score":6.7,"headline":"AbsoluteTelnet 11.12 - \"license name\" Denial of Service","id":"CVE-2020-37165","kev_date_added":null,"published":"2026-02-06"},{"cvss_score":6.7,"headline":"AbsoluteTelnet 11.24 - 'Username' Denial of Service (PoC)","id":"CVE-2021-47765","kev_date_added":null,"published":"2026-01-15"}],"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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-01","vendors":["Celestialsoftware"]},"summary":"Local attackers can crash AbsoluteTelnet by pasting long payloads into DialUp and license fields, causing application termination.","url":"https://insights.sbomify.com/CVE-2021-47764/"}