CVE-2021-20314
CRITICALCVSS 9.8/10EPSS 2.81%
Last modified
CVE-2021-20314 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 2.81% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Libspf2 | Libspf2 | < 1.2.11 |
| Redhat | Enterprise Linux | 7.0 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 34 |
| Fedoraproject | Fedora | 35 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1993070Issue Tracking, Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1993070Issue Tracking, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-20314?
CVE-2021-20314 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.81% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20314?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-20309A flaw was found in ImageMagick in versions before 7.0.11 an…7.5
- CVE-2021-2031Vulnerability in the MySQL Server product of Oracle MySQL (c…4.9
- CVE-2021-20310A flaw was found in ImageMagick in versions before 7.0.11, w…7.5
- CVE-2021-20311A flaw was found in ImageMagick in versions before 7.0.11, w…7.5
- CVE-2021-20312A flaw was found in ImageMagick in versions 7.0.11, where an…7.5
- CVE-2021-20313A flaw was found in ImageMagick in versions before 7.0.11. A…7.5
- CVE-2021-20315A locking protection bypass flaw was found in some versions …6.1
- CVE-2021-20316A flaw was found in the way Samba handled file/directory met…6.8
- CVE-2021-20317A flaw was found in the Linux kernel. A corrupted timer tree…4.4
- CVE-2021-20318The HornetQ component of Artemis in EAP 7 was not updated wi…7.2
- CVE-2021-20319An improper signature verification vulnerability was found i…7.8
- CVE-2021-2032Vulnerability in the MySQL Server product of Oracle MySQL (c…4.3
Are you affected by CVE-2021-20314?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST