CVE-2021-41498: Buffer overflow in ajaxsoundstudio.com Pyo &lt and 1.03 in the Server_jack_init function

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2021-41498 is a high-severity flaw (CVSS 7.5) affecting pyo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in ajaxsoundstudio.com Pyo &lt and 1.03 in the Server_jack_init function. which allows attackers to conduct Denial of Service attacks by arbitrary constructing a overlong server name.

Why this priority

High 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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-120
Published	2021-12-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: pyo project

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

Am I affected?

Timeline

2021-12-17 21:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

pyo project pyo DOWNGRADE

Affected: 1.03

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.03

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.03 (Debian / Ubuntu)

apt-cache madison pyo sudo apt install pyo=<VERSION_BEFORE_1.03> sudo apt-mark hold pyo

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

dnf --showduplicates list pyo sudo dnf downgrade pyo-<VERSION_BEFORE_1.03> sudo dnf versionlock add pyo

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-2021-41498?

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

Is CVE-2021-41498 being exploited?

CVE-2021-41498 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-2021-41498 affect?

CVE-2021-41498 affects pyo. Severity is high (CVSS 7.5). Buffer overflow in ajaxsoundstudio.com Pyo &lt and 1.03 in the Server_jack_init function. which allows attackers to conduct Denial of Service attacks by arbitrary constructing a overlong server name.

How urgent is CVE-2021-41498?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-41499 HIGH 7.5 UPGRADE Buffer Overflow Vulnerability exists in ajaxsoundstudio.com n Pyo < 1.03 in the Server_debug function, which a

References

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