What is CVE-2019-11542?

CVE-2019-11542 is a high-severity vulnerability in Ivanti Connect Secure, classified under Out-of-bounds Write. CVSS score: 7.2/10. Published 2019-04-26.

How severe is CVE-2019-11542?

High severity. CVSS v3 base score is 7.2 out of 10.

Is CVE-2019-11542 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Ivanti Connect Secure

CVE-2019-11542

In Pulse Secure Pulse Connect Secure version 9.0RX before 9.0R3.4, 8.3RX before 8.3R7.1, 8.2RX before 8.2R12.1, and 8.1RX before 8.1R15.1 and Pulse Policy Secure version 9.0RX before 9.0R3.2, 5.4RX before 5.4R7.1, 5.3RX before 5.3R12.1, 5.2RX before 5.2R12.1, and 5.1RX before 5.1R15.1, an authenticated attacker (via the admin web interface) can send a specially crafted message resulting in a stack buffer overflow.

Vulnerability class: Buffer Overflow

Published 2019-04-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.656 (99.3th percentile), scored 2026-10-29.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.656 · newest: 0.656 · change: 0.000

Affected products

Ivanti Connect Secure — versions 8.1, 8.2, 8.3
Pulsesecure Pulse Connect Secure — versions 8.1r1.0, 8.2r1.0, 8.2r1.1
Pulsesecure Pulse Policy Secure — versions 5.1r1.0, 5.1r1.1, 5.1r2.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44101 (Vendor Advisory)
www.securityfocus.com/bid/108073 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0010 (Third Party Advisory)
i.blackhat.com/USA-19/Wednesday/us-19-Tsai-Infiltrating-Corporate-Intranet-Like… (Exploit, Third Party Advisory)
devco.re/blog/2019/09/02/attacking-ssl-vpn-part-3-the-golden-Pulse-Secure-ssl-v… (Exploit, Third Party Advisory)
www.kb.cert.org/vuls/id/927237 (US Government Resource, Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2019-11542?: CVE-2019-11542 is a high-severity vulnerability in Ivanti Connect Secure, classified under Out-of-bounds Write. CVSS score: 7.2/10. Published 2019-04-26.
How severe is CVE-2019-11542?: High severity. CVSS v3 base score is 7.2 out of 10.
Is CVE-2019-11542 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.