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Fencer Vulns
critical 9.8

CVE-2021-20307 json

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

published 2021-04-05 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-7732

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

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

Patch / fix

  • libpano13 Debian 14, Debian 13, Debian 12 2.9.20~rc3+dfsg-1

debian advisories DEBIAN-CVE-2021-20307

  • libpano13 Ubuntu 20.04 LTS 2.9.19+dfsg-3ubuntu0.20.04.1
  • libpano13 Ubuntu Pro 16.04 LTS 2.9.19+dfsg-2ubuntu0.1~esm1
  • libpano13 Ubuntu Pro 18.04 LTS 2.9.19+dfsg-3ubuntu0.18.04.1~esm1
  • libpano13 Ubuntu Pro 22.04 LTS 2.9.20~rc3+dfsg-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-20307

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libpano13 Arch Linux 2.9.20-1

arch linux advisories AVG-1774

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-20307 updated cvss 7.4

libpano13: Format string vulnerability in panoFileOutputNamesCreate()

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.94% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a libpano13

Classification

Weakness
  • CWE-134 Use of Externally-Controlled Format String

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.