{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2020-21524 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2020-21524 yet. Limit exposure of the affected software until one is available.","what":"CVE-2020-21524 is a critical vulnerability in n/a, published on 30 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-21524 and fix it if it is affected.\n\nWhat it is: CVE-2020-21524 is a critical vulnerability in n/a, published on 30 Sep 2020. 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-2020-21524 in the wild and no public exploit code.\n\nAffected product: n/a. 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-2020-21524/ (Markdown: https://insights.sbomify.com/CVE-2020-21524/index.md)","id":"CVE-2020-21524","markdown":"https://insights.sbomify.com/CVE-2020-21524/index.md","name":"CVE-2020-21524","record":{"aliases":["GHSA-mr5m-8j6x-5qpr"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["data_read","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Halo blog platform","requires_auth":"none","summary":"An attacker can exploit an XML External Entity vulnerability in Halo's blog import feature to read files and launch DDoS attacks.","user_interaction":"not_required","vuln_class":"xxe"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"halo","vendor":"halo"}],"cvss":{"score":9.1,"severity":"critical","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-611","name":"Improper Restriction of XML External Entity Reference"}],"description":"There is a XML external entity (XXE) vulnerability in halo v1.1.3, The function of importing other blogs in the background(/api/admin/migrations/wordpress) needs to parse the xml file, but it is not used for security defense, This vulnerability can detect the intranet, read files, enable ddos attacks, etc. exp:https://github.com/halo-dev/halo/issues/423","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":"XML external entity in n/a","id":"CVE-2020-21524","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xxe","year":"2020"},"n_packages":0,"n_references":1,"next":{"headline":"Path traversal in n/a","id":"CVE-2020-21525"},"packages":[],"prev":{"headline":"Code injection in n/a","id":"CVE-2020-21523"},"products":["n/a"],"published":"2020-09-30","related":[{"cvss_score":9.8,"headline":"File upload in n/a","id":"CVE-2022-32994","kev_date_added":null,"published":"2022-06-27"},{"cvss_score":9.8,"headline":"Server-side request forgery in n/a","id":"CVE-2022-32995","kev_date_added":null,"published":"2022-06-27"},{"cvss_score":9.8,"headline":"Code injection in n/a","id":"CVE-2020-18980","kev_date_added":null,"published":"2021-07-12"},{"cvss_score":9.8,"headline":"Path traversal in n/a","id":"CVE-2020-21522","kev_date_added":null,"published":"2020-09-30"},{"cvss_score":9.8,"headline":"Code injection in n/a","id":"CVE-2020-21523","kev_date_added":null,"published":"2020-09-30"},{"cvss_score":9.8,"headline":"Path traversal in n/a","id":"CVE-2020-21526","kev_date_added":null,"published":"2020-09-30"},{"cvss_score":9.1,"headline":"Server-side request forgery in n/a","id":"CVE-2025-44594","kev_date_added":null,"published":"2025-09-09"}],"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["n/a"]},"summary":"An attacker can exploit an XML External Entity vulnerability in Halo's blog import feature to read files and launch DDoS attacks.","url":"https://insights.sbomify.com/CVE-2020-21524/"}