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CVE-2019-20637

HIGH

7.5

CVSS Score

Published: April 8, 2020 at 11:01 PM UTC

Updated: June 17, 2026 at 02:30 AM UTC

4 products affected across 3 vendorsLeapBackports SleVarnish Cache

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Severity

HIGH7.5

Exploit prediction

EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Backports Sle · openSUSE

95%

Leap · openSUSEdrupal

95%

Varnish Cache · Varnish Cache

95%

6.1.0 ≤ v < 6.2.26.3.0 ≤ v < 6.3.1

Affected range stops below 6.2.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.3.1, so it looks safe — our inference, not a vendor statement

Varnish Cache · Varnish Software

95%

6.0.0 ≤ v < 6.0.5

Affected range stops below 6.0.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory

Source: [email protected]

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00026.html

Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory

Source: [email protected]

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00031.html

x_refsource_MISCVendor Advisory

Source: [email protected]

http://varnish-cache.org/security/VSV00004.html#vsv00004

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-212

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