How severe is CVE-2018-20850?

CVE-2018-20850 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-20850 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20850?

CVE-2018-20850 affects Stormshield Stormshield Network Security. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20850?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-20850 published?

CVE-2018-20850 was published on 2019-07-04 and last updated on 2026-06-17.

CVE-2018-20850

CVE-2018-20850 is a high-severity vulnerability in Stormshield Stormshield Network Security with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.2)
CVSS v2: 7.2
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Stormshield Stormshield Network Security
Published: 2019-07-04
Last modified: 2026-06-17

Description

Stormshield Network Security 2.0.0 through 2.13.0 and 3.0.0 through 3.7.1 has self-XSS in the command line interface of the SNS web server.

Frequently asked questions

What is CVE-2018-20850?: Stormshield Network Security 2.0.0 through 2.13.0 and 3.0.0 through 3.7.1 has self-XSS in the command line interface of the SNS web server.
How severe is CVE-2018-20850?: CVE-2018-20850 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-20850 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20850?: CVE-2018-20850 affects Stormshield Stormshield Network Security. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20850?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-20850 published?: CVE-2018-20850 was published on 2019-07-04 and last updated on 2026-06-17.

References

https://advisories.stormshield.eu/2018-006/

Affected products (1)

cpe:2.3:a:stormshield:stormshield_network_security:*:*:*:*:*:*:*:*

More vulnerabilities in Stormshield Stormshield Network Security

CVE-2023-20032 — Critical (CVSS 9.8): On Feb 15, 2023, the following vulnerability in the ClamAV scanning library was disclosed: A vulnerability in the…
CVE-2022-37434 — Critical (CVSS 9.8): zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c via a large gzip…
CVE-2021-31617 — Critical (CVSS 9.8): In ASQ in Stormshield Network Security (SNS) 1.0.0 through 2.7.8, 2.8.0 through 2.16.0, 3.0.0 through 3.7.20, 3.8.0…
CVE-2020-7465 — Critical (CVSS 9.8): The L2TP implementation of MPD before 5.9 allows a remote attacker who can send specifically crafted L2TP control…
CVE-2025-48707 — High (CVSS 7.5): An issue was discovered in Stormshield Network Security (SNS) before 5.0.1. TPM authentication information could, in…
CVE-2023-28616 — High (CVSS 7.5): An issue was discovered in Stormshield Network Security (SNS) before 4.3.17, 4.4.x through 4.6.x before 4.6.4, and…

All CVEs affecting Stormshield Stormshield Network Security →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →