CVE-2018-20809

HIGHNVD 7.57.5—

7.5

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.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 87.5%
KEV: Not listed

Published

June 28, 2019

Last Modified

November 21, 2024

References (2)

cve@mitrehttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43877/
af854a3a-2127-422b-91ae-364da2661108https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43877/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-20Improper Input Validation

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:14 UTCEPSS rescore
2026-06-08 14:14 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
2026-05-29 13:41 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-27 17:55 UTCEG score recompute
2026-05-27 17:55 UTCGHSA enrichment
2026-05-27 13:38 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-20809?

CVE-2018-20809 is a high vulnerability published on June 28, 2019. 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.

When was CVE-2018-20809 disclosed?

CVE-2018-20809 was first published in the National Vulnerability Database on June 28, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-20809 actively exploited?

CVE-2018-20809 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-20809?

CVE-2018-20809 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2018-20809?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20809, 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.

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CVE-2018-20809

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-20809?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)