How severe is CVE-2018-20811?

CVE-2018-20811 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2018-20811 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20811?

CVE-2018-20811 primarily affects Ivanti Connect Secure. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-20811?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-20811 published?

CVE-2018-20811 was published on 2019-06-28 and last updated on 2026-06-17.

CVE-2018-20811

CVE-2018-20811 is a medium-severity vulnerability in Ivanti Connect Secure with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Ivanti Connect Secure
Published: 2019-06-28
Last modified: 2026-06-17

Description

A hidden RPC service issue was found with Pulse Secure Pulse Connect Secure 8.3RX before 8.3R2 and 8.1RX before 8.1R12.

Frequently asked questions

What is CVE-2018-20811?: A hidden RPC service issue was found with Pulse Secure Pulse Connect Secure 8.3RX before 8.3R2 and 8.1RX before 8.1R12.
How severe is CVE-2018-20811?: CVE-2018-20811 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2018-20811 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20811?: CVE-2018-20811 primarily affects Ivanti Connect Secure. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-20811?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-20811 published?: CVE-2018-20811 was published on 2019-06-28 and last updated on 2026-06-17.

References

https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43877/

Affected products (19)

cpe:2.3:a:ivanti:connect_secure:8.1:r1.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r1.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r10.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r11.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r11.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r2.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r2.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r3.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r3.2:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r4.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r4.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r5.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r6.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r7.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r8.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r9.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r9.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.1:r9.2:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.3:r1:*:*:*:*:*:*

More vulnerabilities in Ivanti Connect Secure

CVE-2021-22893 — Critical (CVSS 10.0): Pulse Connect Secure 9.0R3/9.1R1 and higher is vulnerable to an authentication bypass vulnerability exposed by the…
CVE-2019-11510 — Critical (CVSS 10.0): In Pulse Secure Pulse Connect Secure (PCS) 8.2 before 8.2R12.1, 8.3 before 8.3R7.1, and 9.0 before 9.0R3.4, an…
CVE-2016-4787 — Critical (CVSS 10.0): Pulse Connect Secure (PCS) 8.2 before 8.2r1, 8.1 before 8.1r2, 8.0 before 8.0r10, and 7.4 before 7.4r13.4 allow remote…
CVE-2025-22467 — Critical (CVSS 9.9): A stack-based buffer overflow in Ivanti Connect Secure before version 22.7R2.6 allows a remote authenticated attacker…
CVE-2024-21894 — Critical (CVSS 9.8): A heap overflow vulnerability in IPSec component of Ivanti Connect Secure (9.x, 22.x) and Ivanti Policy Secure allows…
CVE-2018-20813 — Critical (CVSS 9.8): An input validation issue has been found with login_meeting.cgi in Pulse Secure Pulse Connect Secure 8.3RX before 8.3R2.

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