CVE-2021-28683: Null Pointer Dereference
First published: Wed Mar 24 2021(Updated: )
An issue was discovered in Envoy through 1.71.1. There is a remotely exploitable NULL pointer dereference and crash in TLS when an unknown TLS alert code is received.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Envoyproxy Envoy | =1.16.2 | |
| Envoyproxy Envoy | =1.17.1 | |
| redhat/envoyproxy/envoy | <1.17.2 | 1.17.2 |
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Reference Links
- https://blog.envoyproxy.io
- https://github.com/envoyproxy/envoy/releases
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-r22g-5f3x-xjgg
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-xw4q-6pj2-5gfg
- https://istio.io/latest/news/security/istio-security-2021-003/
- https://access.redhat.com/errata/RHSA-2021:1324
- https://access.redhat.com/errata/RHSA-2021:1322
- https://access.redhat.com/security/cve/cve-2021-28683
- https://bugzilla.redhat.com/show_bug.cgi?id=1942263
Frequently Asked Questions
What is CVE-2021-28683?
CVE-2021-28683 is a vulnerability in Envoy that allows remote attackers to cause a NULL pointer dereference and crash in TLS when an unknown TLS alert code is received.
What is the severity of CVE-2021-28683?
CVE-2021-28683 has a severity rating of 7.5 (high).
Which versions of Envoy are affected by CVE-2021-28683?
Envoy versions 1.16.2 and 1.17.1 are affected by CVE-2021-28683.
How can I fix CVE-2021-28683?
To fix CVE-2021-28683, update to Envoy version 1.17.2 or later.
Where can I find more information about CVE-2021-28683?
You can find more information about CVE-2021-28683 on the Envoy blog, Envoy GitHub releases page, and Envoy GitHub security advisories page.
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