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Use-after-free when tunneling TCP over HTTP, if downstream disconnects during upstream connection establishment

Moderate
mattklein123 published GHSA-cmx3-fvgf-83mf Feb 22, 2022

Package

envoy (C++)

Affected versions

1.21.0 and earlier

Patched versions

1.18.6, 1.19.3, 1.20.2, 1.21.1

Description

CVSS Score 6.1 AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L

Impact

Denial of Service (Crash)

Patches

Workarounds

No.

References

https://blog.envoyproxy.io
https://github.com/envoyproxy/envoy/releases

For more information

Open an issue in Envoy repo
Email us at envoy-security

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L

CVE ID

CVE-2021-43826

Weaknesses