CVE-2025-63749: pnetlab 5.3.11 is vulnerable to Command Injection via the qemu_options parameter.

This week

MEDIUM 6.5REMOTEDOWNGRADE

CVE-2025-63749 is a medium-severity flaw (CVSS 6.5) affecting pnetlab. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

pnetlab 5.3.11 is vulnerable to Command Injection via the qemu_options parameter.

Why this priority

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	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-77
Published	2025-11-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: pnetlab

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

Am I affected?

Timeline

2025-11-18 19:15 UTCPublished CVE record published
2026-06-17 09:53 UTCUpdated Record last modified

pnetlab pnetlab DOWNGRADE

Affected: 5.3.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.3.11

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.3.11 (Debian / Ubuntu)

apt-cache madison pnetlab sudo apt install pnetlab=<VERSION_BEFORE_5.3.11> sudo apt-mark hold pnetlab

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

dnf --showduplicates list pnetlab sudo dnf downgrade pnetlab-<VERSION_BEFORE_5.3.11> sudo dnf versionlock add pnetlab

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-2025-63749?

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

Is CVE-2025-63749 being exploited?

CVE-2025-63749 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-2025-63749 affect?

CVE-2025-63749 affects pnetlab. Severity is medium (CVSS 6.5). pnetlab 5.3.11 is vulnerable to Command Injection via the qemu_options parameter.

How urgent is CVE-2025-63749?

Priority 48/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

QEMU vulnerabilities

Related CVEs

CVE-2024-51112 MEDIUM 6.1 DOWNGRADE Open Redirect vulnerability in Pnetlab 5.3.11 allows an attacker to manipulate URLs to redirect users to arbit
CVE-2024-51111 MEDIUM 4.1 DOWNGRADE Cross-Site Scripting (XSS) vulnerability in Pnetlab 5.3.11 allows an attacker to inject malicious scripts into

References

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