CVE & CISA-KEV Catalog

CVE-2021-20314

CRITICALEPSS 85th pctl
9.8
CVSS v3
NVD

Description

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.

CWE-787Out-of-bounds Write

How to fix

Remediation Available
libspf2Debian
Fixed in:1.2.10-7.1~deb11u1CVE-2021-20314
Fixed in:1.2.10-7.1CVE-2021-20314
Fixed in:1.2.10-7.1CVE-2021-20314
Fixed in:1.2.10-7.1CVE-2021-20314
libmail-spf-xs-perlUbuntu
Fixed in:1.2.10-6ubuntu0.1~esm1USN-6584-1
Fixed in:1.2.10-7ubuntu0.18.04.1~esm1USN-6584-1
Fixed in:1.2.10-7+deb9u2build0.20.04.1USN-6584-1
libspf2Ubuntu
Fixed in:1.2.10-6ubuntu0.1~esm1USN-6584-1
Fixed in:1.2.10-7ubuntu0.18.04.1~esm1USN-6584-1
Fixed in:1.2.10-7+deb9u2build0.20.04.1USN-6584-1
libspf2-2Ubuntu
Fixed in:1.2.10-6ubuntu0.1~esm1USN-6584-1
Fixed in:1.2.10-7ubuntu0.18.04.1~esm1USN-6584-1
Fixed in:1.2.10-7+deb9u2build0.20.04.1USN-6584-1
libspf2-devUbuntu
Fixed in:1.2.10-6ubuntu0.1~esm1USN-6584-1
Fixed in:1.2.10-7ubuntu0.18.04.1~esm1USN-6584-1
Fixed in:1.2.10-7+deb9u2build0.20.04.1USN-6584-1
spfqueryUbuntu
Fixed in:1.2.10-6ubuntu0.1~esm1USN-6584-1
Fixed in:1.2.10-7ubuntu0.18.04.1~esm1USN-6584-1
Fixed in:1.2.10-7+deb9u2build0.20.04.1USN-6584-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

2.81%probability of exploitation in 30 days
85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2025-22457Critical9.0100%KEV + RansomFix
CVE-2025-0282Critical9.0100%KEV + Ransom-
CVE-2015-3113Critical9.8100%KEVFix
CVE-2021-20038Critical9.8100%KEV + Ransom-
CVE-2023-4863High8.8100%KEVFix
CVE-2020-16040Medium6.5100%-Fix
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CVE-2021-20314 severity badge

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.