{"answers":{"affected":"2 open source packages ship an affected version, including DNS. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-4248 in the wild and no public exploit code.","fix":"Upgrade DNS to 7.0.0 or later.","what":"CVE-2021-4248 is a medium-severity vulnerability in kapetan dns, published on 18 Dec 2022. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-4248 and fix it if it is affected.\n\nWhat it is: CVE-2021-4248 is a medium-severity vulnerability in kapetan dns, published on 18 Dec 2022. 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-2021-4248 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- DNS (NuGet): affected all versions; fixed in 7.0.0\n- DNS (NuGet): affected all versions; fixed in 7.0.0\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-2021-4248/ (Markdown: https://insights.sbomify.com/CVE-2021-4248/index.md)","id":"CVE-2021-4248","markdown":"https://insights.sbomify.com/CVE-2021-4248/index.md","name":"CVE-2021-4248","record":{"aliases":["GHSA-g3wc-xv93-445q"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"DNS library","requires_auth":"none","summary":"Insufficient entropy in the PRNG allows remote attackers to predict DNS request identifiers, potentially enabling cache poisoning or spoofing attacks.","user_interaction":"not_required","vuln_class":"weak_cryptography"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulDB","cpe":[{"product":"kapetan_dns","vendor":"kapetan_dns_project"}],"cvss":{"score":5.6,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-330","name":"Use of Insufficiently Random Values"}],"description":"A vulnerability was found in kapetan dns up to 6.1.0. It has been rated as problematic. Affected by this issue is some unknown functionality of the file DNS/Protocol/Request.cs. The manipulation leads to insufficient entropy in prng. The attack may be launched remotely. Upgrading to version 7.0.0 is able to address this issue. The name of the patch is cf7105aa2aae90d6656088fe5a8ee1d5730773b6. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216188.","ecosystems":["NuGet"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"kapetan dns Request.cs entropy","id":"CVE-2021-4248","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"NuGet","product":null,"products":[],"type":"weak_cryptography","year":"2021"},"n_packages":2,"n_references":4,"next":{"headline":"xml-conduit DOCTYPE Entity Expansion Parse.hs infinite loop","id":"CVE-2021-4249"},"packages":[{"ecosystem":"NuGet","fixed":["7.0.0"],"introduced":["0"],"last_affected":[],"package":"DNS","purl":null,"source":"GHSA-g3wc-xv93-445q"},{"ecosystem":"NuGet","fixed":["7.0.0"],"introduced":["0"],"last_affected":[],"package":"DNS","purl":"pkg:nuget/DNS","source":"GHSA-g3wc-xv93-445q"}],"prev":{"headline":"OWASP NodeGoat Query Parameter research.js denial of service","id":"CVE-2021-4247"},"products":["dns"],"published":"2022-12-18","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"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":"2025-04-15","vendors":["kapetan"]},"summary":"Insufficient entropy in the PRNG allows remote attackers to predict DNS request identifiers, potentially enabling cache poisoning or spoofing attacks.","url":"https://insights.sbomify.com/CVE-2021-4248/"}