CVE-2020-7881: The vulnerability function is enabled when the streamer service related to the AfreecaTV communicated through

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HIGH 7.5DOWNGRADE

CVE-2020-7881 is a high-severity flaw (CVSS 7.5) affecting afreecatv. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The vulnerability function is enabled when the streamer service related to the AfreecaTV communicated through web socket using 21201 port. A stack-based buffer overflow leading to remote code execution was discovered in strcpy() operate by "FanTicket" field. It is because of stored data without validation of length.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-190, CWE-787
Published	2021-11-26
Last modified	2026-06-17

Publisher (CNA): KrCERT/CC · Vendor: afreecatv

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

Am I affected?

Timeline

2021-11-26 17:15 UTCPublished CVE record published
2026-06-17 03:25 UTCUpdated Record last modified

afreecatv afreecatv DOWNGRADE

Affected: 1.0.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.0.1 (Debian / Ubuntu)

apt-cache madison afreecatv sudo apt install afreecatv=<VERSION_BEFORE_1.0.0.1> sudo apt-mark hold afreecatv

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

dnf --showduplicates list afreecatv sudo dnf downgrade afreecatv-<VERSION_BEFORE_1.0.0.1> sudo dnf versionlock add afreecatv

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-2020-7881?

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

Is CVE-2020-7881 being exploited?

CVE-2020-7881 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-2020-7881 affect?

CVE-2020-7881 affects afreecatv. Severity is high (CVSS 7.5). The vulnerability function is enabled when the streamer service related to the AfreecaTV communicated through web socket using 21201 port. A stack-based buffer overflow leading to remote code execution was discovered in strcpy() operate by

How urgent is CVE-2020-7881?

Priority 45/100. High severity

References

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