CVEvulnerability
CVE-2021-33912
9.8 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2022-01-19
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 9.3 HIGH — AV:N/AC:M/Au:N/C:C/I:C/A:C
- Weaknesses
- CWE-787
Description
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.
Affected configurations
• libspf2 project libspf2 (< 1.2.11)
• debian debian linux 9.0
Related
Weakness · CWE (1)
- CWE-787 Out-of-bounds Write weakness
References
- https://github.com/shevek/libspf2/tree/8131fe140704eaae695e76b5cd09e39bd1dd220b Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00015.html Mailing List, Third Party Advisory
- https://nathanielbennett.com/blog/libspf2-cve-jan-2022-disclosure Exploit, Third Party Advisory
- https://security.gentoo.org/glsa/202401-22 security.gentoo.org
- https://github.com/shevek/libspf2/tree/8131fe140704eaae695e76b5cd09e39bd1dd220b Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00015.html Mailing List, Third Party Advisory
- https://nathanielbennett.com/blog/libspf2-cve-jan-2022-disclosure Exploit, Third Party Advisory
- https://security.gentoo.org/glsa/202401-22 security.gentoo.org