A Cross-Site Scripting vulnerability in Fortinet FortiOS versions 5.6.0 and earlier allows attackers to execute unauthorized code or commands via the Replacement Message HTML for SSL-VPN.
CVE-2017-3133
MEDIUMNVD 6.16.1—Weaponized
EchelonGraph scoreMEDIUM confidence
Score 6.1 from GitHub Security Advisory published 2022-05-17. NVD baseline CVSS 6.1; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 11%CVSS: 6.1Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.1
- EG Score
- 6.1(medium)
- EPSS
- 95.3%
- KEV
- Not listed
Published
September 12, 2017
Last Modified
May 13, 2026
References (8)
- psirt@fortinethttp://www.securityfocus.com/bid/100009
- psirt@fortinethttp://www.securitytracker.com/id/1039020
- psirt@fortinethttps://fortiguard.com/advisory/FG-IR-17-104
- psirt@fortinethttps://www.exploit-db.com/exploits/42388/
- af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/100009
- af854a3a-2127-422b-91ae-364da2661108http://www.securitytracker.com/id/1039020
- af854a3a-2127-422b-91ae-364da2661108https://fortiguard.com/advisory/FG-IR-17-104
- af854a3a-2127-422b-91ae-364da2661108https://www.exploit-db.com/exploits/42388/
Publicly available exploits
(2 references)Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
- Exploit-DBEDB-42388✓ verifiedFirst seen Jul 28, 2017
Fortinet FortiOS < 5.6.0 - Cross-Site Scripting
Open source ↗ - Nucleihttp/cves/2017/CVE-2017-3133.yamlFirst seen Jan 1, 2017
Fortinet FortiOS < 5.6.0 - Cross-Site Scripting
Open source ↗
Frequently asked(5)
What is CVE-2017-3133?
CVE-2017-3133 is a medium vulnerability published on September 12, 2017. A Cross-Site Scripting vulnerability in Fortinet FortiOS versions 5.6.0 and earlier allows attackers to execute unauthorized code or commands via the Replacement Message HTML for SSL-VPN.
When was CVE-2017-3133 disclosed?
CVE-2017-3133 was first published in the National Vulnerability Database on September 12, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-3133 actively exploited?
CVE-2017-3133 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-3133?
CVE-2017-3133 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2017-3133?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-3133, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2017-3133
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