Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2021-33912

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 SPF_record_expand_data in spf_expand.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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.013
EPSS Ranking 79.2%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 9.3
Products affected by CVE-2021-33912


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