How severe is CVE-2018-20812?

CVE-2018-20812 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-20812 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20812?

CVE-2018-20812 primarily affects Pulsesecure Pulse Secure Desktop Client. In total, 53 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-20812?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-20812 published?

CVE-2018-20812 was published on 2019-06-28 and last updated on 2026-06-17.

CVE-2018-20812

CVE-2018-20812 is a high-severity vulnerability in Pulsesecure Pulse Secure Desktop Client with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Pulsesecure Pulse Secure Desktop Client
Published: 2019-06-28
Last modified: 2026-06-17

Description

An information exposure issue where IPv6 DNS traffic would be sent outside of the VPN tunnel (when Traffic Enforcement was enabled) exists in Pulse Secure Pulse Secure Desktop 9.0R1 and below. This is applicable only to dual-stack (IPv4/IPv6) endpoints.

Frequently asked questions

What is CVE-2018-20812?: An information exposure issue where IPv6 DNS traffic would be sent outside of the VPN tunnel (when Traffic Enforcement was enabled) exists in Pulse Secure Pulse Secure Desktop 9.0R1 and below. This is applicable only to dual-stack (IPv4/IPv6) endpoints.
How severe is CVE-2018-20812?: CVE-2018-20812 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2018-20812 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20812?: CVE-2018-20812 primarily affects Pulsesecure Pulse Secure Desktop Client. In total, 53 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-20812?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-20812 published?: CVE-2018-20812 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 (53)

cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r1.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r10.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r11.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r11.1:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r12.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r13.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r2.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r3.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r4.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r5.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r6.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r7.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r8.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r9.0:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r9.1:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:4.0:r9.2:*:*:*:mac_os_x:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r1.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r1.1:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r10.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r11.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r11.1:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r12.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r13.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r14.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r2.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r3.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r3.1:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r4.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r5.1:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r6.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r7.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r8.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r9.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1:r9.1:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1r:3.2:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.1r:5.0:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.3:r1:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.3:r1.1:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.3:r2:*:*:*:macos:*:*
cpe:2.3:a:pulsesecure:pulse_secure_desktop_client:5.3:r3:*:*:*:macos:*:*

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