CVE-2021-33798: A null pointer dereference was found in libpano13, version libpano13-2.9.20

Routine

MEDIUM 4.7DOWNGRADE

CVE-2021-33798 is a medium-severity flaw (CVSS 4.7) affecting libpano13. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A null pointer dereference was found in libpano13, version libpano13-2.9.20. The flow allows attackers to cause a denial of service and potential code execute via a crafted file.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-476
Published	2023-07-07
Last modified	2026-06-17

Publisher (CNA): Fedora Project · Vendor: libpano13 project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-07 18:15 UTCPublished CVE record published
2026-06-17 03:55 UTCUpdated Record last modified

libpano13 project libpano13 DOWNGRADE

Affected: 2.9.20

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.9.20

1. Check installed version

apt-cache policy libpano13 || rpm -q libpano13 || libpano13 --version

2. No fixed release: DOWNGRADE to a release before 2.9.20 (Debian / Ubuntu)

apt-cache madison libpano13 sudo apt install libpano13=<VERSION_BEFORE_2.9.20> sudo apt-mark hold libpano13

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libpano13 sudo dnf downgrade libpano13-<VERSION_BEFORE_2.9.20> sudo dnf versionlock add libpano13

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-33798?

libpano13: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-33798 being exploited?

CVE-2021-33798 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-33798 affect?

CVE-2021-33798 affects libpano13. Severity is medium (CVSS 4.7). A null pointer dereference was found in libpano13, version libpano13-2.9.20. The flow allows attackers to cause a denial of service and potential code execute via a crafted file.

How urgent is CVE-2021-33798?

Priority 32/100. Public exploit reference

Related CVEs

CVE-2021-33293 CRITICAL 9.1 DOWNGRADE MITIGATE Panorama Tools libpano13 v2.9.20 was discovered to contain an out-of-bounds read in the function panoParserFin

References

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