CVE-2021-20307

Name: CVE-2021-20307
Creator: NVD / NIST
Published: 2021-04-05T22:15:12.883+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.94%

Last modified Jun 17, 2026

CVE-2021-20307 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Format string vulnerability in panoFileOutputNamesCreate() in libpano13 2.9.20~rc2+dfsg-3 and earlier can lead to read and write arbitrary memory values.. EPSS estimates a 1.94% chance of exploitation in the next 30 days.

Description

Format string vulnerability in panoFileOutputNamesCreate() in libpano13 2.9.20~rc2+dfsg-3 and earlier can lead to read and write arbitrary memory values.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.94%

77.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Libpano13 Project	Libpano13	<= 2.9.19	—
Libpano13 Project	Libpano13	2.9.20	Rc1
Fedoraproject	Fedora	32	—
Fedoraproject	Fedora	33	—
Fedoraproject	Fedora	34	—
Debian	Debian Linux	9.0	—

References

https://bugzilla.redhat.com/show_bug.cgi?id=1946284Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00010.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FVJRXUOBN56ZWP6QQ3NTA6DIFZMDZAEQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JE6YZSXNVD6WZ3AG3ENL2DIHQFF24LYX/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VYDYBKHT2MNMQCUMAVJNZW4VH6MD5BOF/
https://security.gentoo.org/glsa/202107-47Third Party Advisory
https://sourceforge.net/projects/panotools/files/libpano13/libpano13-2.9.20/Product, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1946284Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00010.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FVJRXUOBN56ZWP6QQ3NTA6DIFZMDZAEQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JE6YZSXNVD6WZ3AG3ENL2DIHQFF24LYX/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VYDYBKHT2MNMQCUMAVJNZW4VH6MD5BOF/
https://security.gentoo.org/glsa/202107-47Third Party Advisory
https://sourceforge.net/projects/panotools/files/libpano13/libpano13-2.9.20/Product, Third Party Advisory

Timeline

Published: Apr 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20307?

Format string vulnerability in panoFileOutputNamesCreate() in libpano13 2.9.20~rc2+dfsg-3 and earlier can lead to read and write arbitrary memory values.

How severe is CVE-2021-20307?

CVE-2021-20307 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.94% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20307?

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.

Are you affected by CVE-2021-20307?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST