How severe is CVE-2018-20807?

CVE-2018-20807 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-20807 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20807?

CVE-2018-20807 primarily affects Ivanti Connect Secure. In total, 39 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-20807?

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

When was CVE-2018-20807 published?

CVE-2018-20807 was published on 2019-06-28 and last updated on 2026-06-17.

CVE-2018-20807

CVE-2018-20807 is a medium-severity vulnerability in Ivanti Connect Secure with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Ivanti Connect Secure
Published: 2019-06-28
Last modified: 2026-06-17

Description

An XSS issue has been found in welcome.cgi in Pulse Secure Pulse Connect Secure (PCS) 8.1.x before 8.1R12, 8.2.x before 8.2R9, and 8.3.x before 8.3R3 due to one of the URL parameters not being sanitized properly.

Frequently asked questions

What is CVE-2018-20807?: An XSS issue has been found in welcome.cgi in Pulse Secure Pulse Connect Secure (PCS) 8.1.x before 8.1R12, 8.2.x before 8.2R9, and 8.3.x before 8.3R3 due to one of the URL parameters not being sanitized properly.
How severe is CVE-2018-20807?: CVE-2018-20807 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-20807 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20807?: CVE-2018-20807 primarily affects Ivanti Connect Secure. In total, 39 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-20807?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-20807 published?: CVE-2018-20807 was published on 2019-06-28 and last updated on 2026-06-17.

References

https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730/

Affected products (39)

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:*:*:*:*:*:*
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:8.2:r1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r1.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r1.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r2.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r3.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r3.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r4.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r4.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r5.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r5.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r6.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r7.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r7.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r7.2:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r8.0:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r8.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.2:r8.2:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.3:r1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.3:r2:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:8.3:r2.1:*:*:*:*:*:*

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