A stored cross-site scripting (XSS) vulnerability exists in the SonicOS SSLVPN web interface.

published 2020-10-12 6y ago modified 2026-06-17 4mo ago also EUVD-2020-26389

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.3%; EPSS 1.3% chance of exploitation in 30 days, percentile 69%
public exploits: 0; none known

A stored cross-site scripting (XSS) vulnerability exists in the SonicOS SSLVPN web interface. A remote unauthenticated attacker is able to store and potentially execute arbitrary JavaScript code in the firewall SSLVPN portal. This vulnerability affected SonicOS Gen 5 version 5.9.1.7, 5.9.1.13, Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version SonicOS 7.0.0.0.

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Exploit prediction

1.25% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

SonicWall SonicOS

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

psirt.global.sonicwall.com /vuln-detail/SNWLID-2020-0017
vendor-advisory

Sources

CVE List CVE-2020-5142
NVD CVE-2020-5142

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