CVE-2020-11582

Name: CVE-2020-11582
Creator: NVD / NIST
Published: 2020-04-06T21:15:13.607+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.84%

Last modified Jun 17, 2026

CVE-2020-11582 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An issue was discovered in Pulse Secure Pulse Connect Secure (PCS) through 2020-04-06. The applet in tncc.jar, executed on macOS, Linux, and Solaris clients when a Host Checker policy is enforced, launches a TCP server that accepts local connections on a random port. EPSS estimates a 0.84% chance of exploitation in the next 30 days.

Description

An issue was discovered in Pulse Secure Pulse Connect Secure (PCS) through 2020-04-06. The applet in tncc.jar, executed on macOS, Linux, and Solaris clients when a Host Checker policy is enforced, launches a TCP server that accepts local connections on a random port. This can be reached by local HTTP clients, because up to 25 invalid lines are ignored, and because DNS rebinding can occur. (This server accepts, for example, a setcookie command that might be relevant to CVE-2020-11581 exploitation.)

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.84%

53.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-668

Affected Software

Vendor	Product	Versions
Pulsesecure	Pulse Connect Secure	<= 2020-04-06
Pulsesecure	Pulse Policy Secure	All versions

References

https://git.lsd.cat/g/pulse-host-checker-rceExploit, Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44426Vendor Advisory
https://git.lsd.cat/g/pulse-host-checker-rceExploit, Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44426Vendor Advisory

Timeline

Published: Apr 6, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-11582?

How severe is CVE-2020-11582?

CVE-2020-11582 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.84% probability of exploitation in the next 30 days.

How do I fix CVE-2020-11582?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-11582?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST