CVE-2021-41500: Incomplete string comparison vulnerability exits in cvxopt.org cvxop <= 1.2.6 in APIs (cvxopt.cholmod.diag, cv

Q: How urgent is CVE-2021-41500?

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

This week

HIGH 7.5REMOTEUPGRADEMITIGATE

CVE-2021-41500 is a high-severity flaw (CVSS 7.5) affecting cvxopt, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Incomplete string comparison vulnerability exits in cvxopt.org cvxop <= 1.2.6 in APIs (cvxopt.cholmod.diag, cvxopt.cholmod.getfactor, cvxopt.cholmod.solve, cvxopt.cholmod.spsolve), which allows attackers to conduct Denial of Service attacks by construct fake Capsule objects.

Why this priority

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

A fixed release or distro patch exists.

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 32%)
CISA exploited list	No
Weakness	CWE-697
Published	2021-12-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cvxopt project · fedoraproject

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

cvxopt project cvxopt UPGRADE

Affected: <= 1.2.6

Fixed in: newer than 1.2.6

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show cvxopt

2. UPGRADE to newer than 1.2.6

pip install --upgrade "cvxopt>1.2.6"

fedoraproject fedora MITIGATE

Affected: 34

Fixed in: no fixed release known

Safe to downgrade to: a release before 34

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2021-41500?

cvxopt: upgrade to newer than 1.2.6; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-41500 being exploited?

CVE-2021-41500 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-2021-41500 affect?

CVE-2021-41500 affects cvxopt, fedora. Severity is high (CVSS 7.5). Incomplete string comparison vulnerability exits in cvxopt.org cvxop <= 1.2.6 in APIs (cvxopt.cholmod.diag, cvxopt.cholmod.getfactor, cvxopt.cholmod.solve, cvxopt.cholmod.spsolve), which allows attackers to conduct Denial of Service attacks

How urgent is CVE-2021-41500?

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

References

← Back to latest CVEs