What is CVE-2018-5299?

CVE-2018-5299 is a critical-severity vulnerability in Pulsesecure Pulse Connect Secure, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2018-01-16.

How severe is CVE-2018-5299?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Pulsesecure Pulse Connect Secure

CVE-2018-5299

A stack-based Buffer Overflow Vulnerability exists in the web server in Pulse Secure Pulse Connect Secure (PCS) before 8.3R4 and Pulse Policy Secure (PPS) before 5.4R4, leading to memory corruption and possibly remote code execution.

Vulnerability class: Buffer Overflow

Published 2018-01-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.031 (87.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43604 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2018-5299?: CVE-2018-5299 is a critical-severity vulnerability in Pulsesecure Pulse Connect Secure, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2018-01-16.
How severe is CVE-2018-5299?: Critical severity. CVSS v3 base score is 9.8 out of 10.