What is CVE-2021-20314?

CVE-2021-20314 is a critical-severity vulnerability in Libspf2, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-08-12.

How severe is CVE-2021-20314?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Libspf2

CVE-2021-20314

Stack buffer overflow in libspf2 versions below 1.2.11 when processing certain SPF macros can lead to Denial of service and potentially code execution via malicious crafted SPF explanation messages.

Vulnerability class: Buffer Overflow

EPSS: 0.028 (84.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Libspf2
Fedoraproject Fedora — versions 33, 34, 35
Redhat Enterprise_linux — versions 7.0
N/a Libspf2 — versions 1.2.11

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
secalert@redhat.com (x_refsource_FEDORA, vendor-advisory)
secalert@redhat.com (x_refsource_FEDORA, vendor-advisory)
secalert@redhat.com (x_refsource_FEDORA, vendor-advisory)
secalert@redhat.com

Frequently asked questions

What is CVE-2021-20314?: CVE-2021-20314 is a critical-severity vulnerability in Libspf2, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-08-12.
How severe is CVE-2021-20314?: Critical severity. CVSS v3 base score is 9.8 out of 10.