CVE-2021-40212: An exploitable out-of-bounds write vulnerability in PotPlayer 1.7.21523 build 210729 may lead to code executio

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-40212 is a critical-severity flaw (CVSS 9.8) affecting potplayer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An exploitable out-of-bounds write vulnerability in PotPlayer 1.7.21523 build 210729 may lead to code execution, information disclosure, and denial of service.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-787
Published	2022-06-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: daum

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

Am I affected?

Timeline

2022-06-15 11:15 UTCPublished CVE record published
2026-06-17 04:06 UTCUpdated Record last modified

daum potplayer DOWNGRADE

Affected: 1.7.21523 build_210729

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.21523

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.7.21523 (Debian / Ubuntu)

apt-cache madison potplayer sudo apt install potplayer=<VERSION_BEFORE_1.7.21523> sudo apt-mark hold potplayer

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

dnf --showduplicates list potplayer sudo dnf downgrade potplayer-<VERSION_BEFORE_1.7.21523> sudo dnf versionlock add potplayer

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-2021-40212?

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

Is CVE-2021-40212 being exploited?

CVE-2021-40212 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-2021-40212 affect?

CVE-2021-40212 affects potplayer. Severity is critical (CVSS 9.8). An exploitable out-of-bounds write vulnerability in PotPlayer 1.7.21523 build 210729 may lead to code execution, information disclosure, and denial of service.

How urgent is CVE-2021-40212?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-4246 MEDIUM 4.3 MITIGATE A vulnerability classified as problematic has been found in Kakao PotPlayer

References

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