CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
93.0%
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.
github.com/shevek/libspf2/commit/28faf4624a6a371b11afdb9820078d3b0ee3803d
launchpad.net/bugs/cve/CVE-2021-33912
nvd.nist.gov/vuln/detail/CVE-2021-33912
security-tracker.debian.org/tracker/CVE-2021-33912
ubuntu.com/security/notices/USN-6584-1
ubuntu.com/security/notices/USN-6584-2
www.cve.org/CVERecord?id=CVE-2021-33912
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
93.0%