Vulnerability in SonicWall Sonicos

CVE-2026-0516

A improper neutralization of HTTP Headers for Scripting Syntax vulnerability in SonicOS could allow a remote attacker to manipulate the Host header and redirect firewall management users to arbitrary web domains.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (27.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-0516: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

  • SonicWall Sonicos — versions 7.3.3-7015 and older versions, 6.5.5.1-6n and older versions, 8.2.1-8010 and older versions

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-0516?
CVE-2026-0516 is a medium-severity vulnerability in SonicWall Sonicos, classified under Improper Neutralization of HTTP Headers for Scripting Syntax. CVSS score: 6.5/10. Published 2026-08-05.
How severe is CVE-2026-0516?
Medium severity. CVSS v3 base score is 6.5 out of 10.