No exploitation reportedFix available

CVE-2018-16494

Q: Is CVE-2018-16494 actively exploited?

Active exploitation of CVE-2018-16494 has not been confirmed. Its EPSS score was 1.9% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2018-16494?

CVE-2018-16494 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2021-05-26
Fixed in21.1.1 · 20.2.2 · 16.1r2s11
WeaknessCWE-377 · CWE-668

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

In VOS and overly permissive "umask" may allow for authorized users of the server to gain unauthorized access through insecure file permissions that can result in an arbitrary read, write, or execution of newly created files and directories. Insecure umask setting was present throughout the Versa servers.

Timeline

dates in UTC

2021-05-2619:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2018-16494?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-16494?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Versa-networks versa operating system

Branch	Affected	Fixed in	Source
21.1	≥ 21.1.0, < 21.1.1	21.1.1	NVD
20.2	≥ 20.2.0, < 20.2.2	20.2.2	NVD
16.1	< 16.1r2s11	16.1r2s11	NVD

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

Fix

Update Versa-networks versa operating system to 21.1.1 · 20.2.2 · 16.1r2s11

Detection

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

Sources

NVDCVSS 3.18.8read 2026-10-23
NVDCVSS 2.06.5read 2026-10-23
CNAweakness (CWE)CWE-377read 2026-10-23
NVDweakness (CWE)CWE-668read 2026-10-23
FIRST EPSSEPSS score1.9 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2021-05-26
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-16494?

Is CVE-2018-16494 actively exploited?

Active exploitation of CVE-2018-16494 has not been confirmed. Its EPSS score was 1.9% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-16494?

CVE-2018-16494 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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