CVE-2021-33912
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-33912
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33912.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-33912
- Downstream
- Published
- 2022-01-19T18:15:07Z
- Modified
- 2025-08-09T19:01:26Z
- Severity
-
- 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
libspf2 before 1.2.11 has a four-byte heap-based buffer overflow that might allow remote attackers to execute arbitrary code (via an unauthenticated e-mail message from anywhere on the Internet) with a crafted SPF DNS record, because of incorrect sprintf usage in SPFrecordexpanddata in spfexpand.c. The vulnerable code may be part of the supply chain of a site's e-mail infrastructure (e.g., with additional configuration, Exim can use libspf2; the Postfix web site links to unofficial patches for use of libspf2 with Postfix; older versions of spfquery relied on libspf2) but most often is not.
- References