No exploitation reportedFix available

CVE-2021-38457

Q: Is CVE-2021-38457 actively exploited?

Active exploitation of CVE-2021-38457 has not been confirmed. Its EPSS score was 1.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-38457?

CVE-2021-38457 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2021-10-22
Fixed in8.0.0
WeaknessCWE-284 · CWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The server permits communication without any authentication procedure, allowing the attacker to initiate a session with the server without providing any form of authentication.

Timeline

dates in UTC

2021-10-2212:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-38457?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-38457?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Auvesy versiondog

Branch	Affected	Fixed in	Source
8.0	< 8.0.0	8.0.0	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-292-01 CISA1 known affected
AUVESY Versiondog
Versiondog: All versions prior to v8.0

Full record on NVD

Fix

Update Auvesy versiondog to 8.0.0
Vendor fix CISA ICSA-21-292-01 · 1 productAUVESY recommends upgrading Versiondog to Version 8.1 or later (login required).

Advisories and patches

us-cert.cisa.govPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.19.8read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
CNAweakness (CWE)CWE-284read 2026-10-23
NVDweakness (CWE)CWE-306read 2026-10-23
FIRST EPSSEPSS score1.3 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2021-10-22
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-38457?

The server permits communication without any authentication procedure, allowing the attacker to initiate a session with the server without providing any form of authentication.

Is CVE-2021-38457 actively exploited?

Active exploitation of CVE-2021-38457 has not been confirmed. Its EPSS score was 1.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-38457?

CVE-2021-38457 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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