Is CVE-2019-20637 in the CISA KEV catalog?

No. CVE-2019-20637 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-20637?

CVE-2019-20637 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2019-20637?

CVE-2019-20637 has an EPSS score of 1.75% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-20637?

Upgrade varnish on debian 11 to 6.4.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2019-20637

HIGHEPSS 75th pctl

7.5

CVSS v3

NVD

Description

An issue was discovered in Varnish Cache before 6.0.5 LTS, 6.1.x and 6.2.x before 6.2.2, and 6.3.x before 6.3.1. It does not clear a pointer between the handling of one client request and the next request within the same connection. This sometimes causes information to be disclosed from the connection workspace, such as data structures associated with previous requests within this connection or VCL-related temporary headers.

CWE-212

How to fix

Remediation Available

varnishDebian

Fixed in:6.4.0-1CVE-2019-20637

libvarnishapi1Ubuntu

Fixed in:5.2.1-1ubuntu0.1USN-5474-1

libvarnishapi2Ubuntu

Fixed in:6.2.1-2ubuntu0.1USN-5474-1

Fixed in:6.6.1-1ubuntu0.2USN-5474-1

varnishUbuntu

Fixed in:5.2.1-1ubuntu0.1USN-5474-1

Fixed in:6.2.1-2ubuntu0.1USN-5474-1

Fixed in:6.6.1-1ubuntu0.2USN-5474-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.75%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Vendor Advisory1

varnish-cache.org

Third-Party Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.