{"id":"CVE-2021-32825","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-32825","generatedAt":"2026-10-27T20:22:59.333Z","title":"In bblfshd before commit 4265465b9b6fb5663c30ee43806126012066aad4 there is a \"zipslip\" vulnerability.","description":"bblfshd is an open source self-hosted server for source code parsing. In bblfshd before commit 4265465b9b6fb5663c30ee43806126012066aad4 there is a \"zipslip\" vulnerability. The unsafe handling of symbolic links in an unpacking routine may enable attackers to read and/or write to arbitrary locations outside the designated target folder. This issue may lead to arbitrary file write (with same permissions as the program running the unpack operation) if the attacker can control the archive file. Additionally, if the attacker has read access to the unpacked files, he may be able to read arbitrary system files the parent process has permissions to read. For more details including a PoC see the referenced GHSL-2020-258.","published":"2021-08-16T19:15:14.000Z","lastModified":"2026-06-17T03:53:42.000Z","status":"Modified","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},"cwe":["CWE-23","CWE-59"],"affected":["bblfshd project/bblfshd"],"epss":{"score":0.00918,"percentile":0.59976,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.92%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/bblfsh/bblfshd/commit/4265465b9b6fb5663c30ee43806126012066aad4","tags":["Patch","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/bblfsh/bblfshd/pull/341","tags":["Patch","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://securitylab.github.com/advisories/GHSL-2020-258-zipslip-bblfshd/","tags":["Exploit","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/bblfsh/bblfshd/commit/4265465b9b6fb5663c30ee43806126012066aad4","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/bblfsh/bblfshd/pull/341","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://securitylab.github.com/advisories/GHSL-2020-258-zipslip-bblfshd/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-32825","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}