CVE-2025-66698: An issue in Semantic machines v5.4.8 allows attackers to bypass authentication via sending a crafted HTTP requ

This week

HIGH 8.6REMOTEDOWNGRADE

CVE-2025-66698 is a high-severity flaw (CVSS 8.6) affecting veda. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in Semantic machines v5.4.8 allows attackers to bypass authentication via sending a crafted HTTP request to various API endpoints.

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	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-01-13
Last modified	2026-07-05

Publisher (CNA): MITRE · Vendor: semantic-machines

Last updated 2026-07-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-13 16:15 UTCPublished CVE record published
2026-07-05 17:17 UTCUpdated Record last modified

semantic-machines veda DOWNGRADE

Affected: 5.4.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.4.8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.4.8 (Debian / Ubuntu)

apt-cache madison veda sudo apt install veda=<VERSION_BEFORE_5.4.8> sudo apt-mark hold veda

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

dnf --showduplicates list veda sudo dnf downgrade veda-<VERSION_BEFORE_5.4.8> sudo dnf versionlock add veda

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-2025-66698?

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

Is CVE-2025-66698 being exploited?

CVE-2025-66698 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-2025-66698 affect?

CVE-2025-66698 affects veda. Severity is high (CVSS 8.6). An issue in Semantic machines v5.4.8 allows attackers to bypass authentication via sending a crafted HTTP request to various API endpoints.

How urgent is CVE-2025-66698?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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