How severe is CVE-2020-5519?

CVE-2020-5519 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-5519 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5519?

CVE-2020-5519 affects Litespeedtech Openlitespeed. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5519?

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

When was CVE-2020-5519 published?

CVE-2020-5519 was published on 2020-01-06 and last updated on 2026-06-17.

CVE-2020-5519

CVE-2020-5519 is a critical-severity vulnerability in Litespeedtech Openlitespeed with a CVSS 3.x base score of 9.8. 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-20.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Litespeedtech Openlitespeed
Published: 2020-01-06
Last modified: 2026-06-17

Description

The WebAdmin Console in OpenLiteSpeed before v1.6.5 does not strictly check request URLs, as demonstrated by the "Server Configuration > External App" screen.

Frequently asked questions

What is CVE-2020-5519?: The WebAdmin Console in OpenLiteSpeed before v1.6.5 does not strictly check request URLs, as demonstrated by the "Server Configuration > External App" screen.
How severe is CVE-2020-5519?: CVE-2020-5519 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-5519 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5519?: CVE-2020-5519 affects Litespeedtech Openlitespeed. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5519?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-5519 published?: CVE-2020-5519 was published on 2020-01-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:*

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