Vulnerability · CVE-2018-20809
A crafted message can cause the web server to crash with Pulse Secure Pulse Connect Secure (PCS) 8.3RX before 8.3R5 and Pulse Policy Secure 5.4RX before 5.4R5.
Published Jun 28, 2019 · catalog updated Jun 17, 2026 · connect secure
Last checked Nov 5, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2018-20809. EPSS is 2.73%. Act only if a listed version of connect secure is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
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- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 2.73%
- Remediation
- Advisory link
- Affected products
- cpe ivanti/connect secure · cpe pulsesecure/pulse policy secure
A crafted message can cause the web server to crash with Pulse Secure Pulse Connect Secure (PCS) 8.3RX before 8.3R5 and Pulse Policy Secure 5.4RX before 5.4R5. This is not applicable to PCS 8.1RX.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe ivanti/connect secure8.3
- cpe pulsesecure/pulse policy secure4.4
How to fix CVE-2018-20809
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
Seen in 8.3 · 1 other packages on the advisory
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2018-20809. EPSS is 2.73%. Act only if a listed version of connect secure is installed.
Which versions are affected?
Compare what you have installed with ivanti/connect secure 8.3; pulsesecure/pulse policy secure 4.4. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-20: Improper Input Validation. EPSS 2.73%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Jun 28, 2019 · Monitored products — critical
Detected
A crafted message can cause the web server to crash with Pulse Secure Pulse Connect Secure (PCS) 8.3RX before 8.3R5 and Pulse Policy Secure 5.4RX before 5.4R5. This is not applicable to PCS 8.1RX.
Jun 17, 2026 · Monitored products — critical
Updated
A crafted message can cause the web server to crash with Pulse Secure Pulse Connect Secure (PCS) 8.3RX before 8.3R5 and Pulse Policy Secure 5.4RX before 5.4R5. This is not applicable to PCS 8.1RX.
Sources
- CVE.orgVulnerability recordCVE-2018-20809
Official CVE identifier
cve.org - Monitored products — criticalVendor advisoryCVE-2018-20809
A crafted message can cause the web server to crash with Pulse Secure Pulse Connect Secure (PCS) 8.3RX before 8.3R5 and Pulse Policy Secure 5.4RX before 5.4R5. This is not applicable to PCS 8.1RX.
nvd.nist.gov
References
Freshness
Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- CVE.orgNov 4, 2026
- Monitored products — criticalNov 2, 2026