CVE-2023-36243: FLVMeta v1.2.1 was discovered to contain a buffer overflow via the xml_on_metadata_tag_only function at dump_x

Routine

HIGH 7.8DOWNGRADE

CVE-2023-36243 is a high-severity flaw (CVSS 7.8) affecting flvmeta. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FLVMeta v1.2.1 was discovered to contain a buffer overflow via the xml_on_metadata_tag_only function at dump_xml.c.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-120
Published	2023-06-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: flvmeta

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

Am I affected?

Timeline

2023-06-22 19:15 UTCPublished CVE record published
2026-06-17 06:05 UTCUpdated Record last modified

flvmeta flvmeta DOWNGRADE

Affected: 1.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.1 (Debian / Ubuntu)

apt-cache madison flvmeta sudo apt install flvmeta=<VERSION_BEFORE_1.2.1> sudo apt-mark hold flvmeta

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

dnf --showduplicates list flvmeta sudo dnf downgrade flvmeta-<VERSION_BEFORE_1.2.1> sudo dnf versionlock add flvmeta

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-2023-36243?

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

Is CVE-2023-36243 being exploited?

CVE-2023-36243 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-2023-36243 affect?

CVE-2023-36243 affects flvmeta. Severity is high (CVSS 7.8). FLVMeta v1.2.1 was discovered to contain a buffer overflow via the xml_on_metadata_tag_only function at dump_xml.c.

How urgent is CVE-2023-36243?

Priority 38/100. High severity; Public exploit reference

Related CVEs

CVE-2024-25385 MEDIUM 6.2 DOWNGRADE An issue in flvmeta v.1.2.2 allows a local attacker to cause a denial of service via the flvmeta/src/flv.c:375

References

← Back to latest CVEs