CVE-2021-43825: Use-after-free in Envoy
First published: Fri Feb 04 2022(Updated: )
A flaw was found in envoy. If the amount of buffered data by envoy goes over the limit, the buffer may overflow while a response is being processed by the filter chain. This issue possibly causes the operation to abort incorrectly, resulting in the access of a freed memory block.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/servicemesh-proxy | <0:2.0.9-3.el8 | 0:2.0.9-3.el8 |
| redhat/servicemesh-proxy | <0:2.1.2-4.el8 | 0:2.1.2-4.el8 |
| Envoyproxy Envoy | <1.18.6 | |
| Envoyproxy Envoy | >=1.19.0<1.19.3 | |
| Envoyproxy Envoy | >=1.20.0<1.20.2 | |
| Envoyproxy Envoy | >=1.21.0<1.21.1 |
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Reference Links
- https://github.com/envoyproxy/envoy/commit/148de954ed3585d8b4298b424aa24916d0de6136
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh
- https://access.redhat.com/errata/RHSA-2022:1276
- https://access.redhat.com/errata/RHSA-2022:1275
- https://access.redhat.com/security/cve/cve-2021-43825
- https://bugzilla.redhat.com/show_bug.cgi?id=2050746
- https://www.cve.org/CVERecord?id=CVE-2021-43825 https://nvd.nist.gov/vuln/detail/CVE-2021-43825 https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh
Frequently Asked Questions
What is CVE-2021-43825?
CVE-2021-43825 is a vulnerability found in Envoy, an open-source edge and service proxy, that allows an attacker to cause a denial-of-service (DoS) condition by sending a large amount of buffered request and response data.
What is the severity of CVE-2021-43825?
The severity of CVE-2021-43825 is high, with a severity score of 7.5.
Which software versions are affected by CVE-2021-43825?
CVE-2021-43825 affects the following software versions: servicemesh-proxy 0:2.0.9-3.el8, servicemesh-proxy 0:2.1.2-4.el8, envoy 1.18.6, envoy 1.19.3, envoy 1.20.2, and envoy 1.21.1.
How can the CVE-2021-43825 vulnerability be fixed?
To fix the CVE-2021-43825 vulnerability, update affected software versions to the recommended or later versions: servicemesh-proxy 0:2.0.9-3.el8, servicemesh-proxy 0:2.1.2-4.el8, envoy 1.18.6, envoy 1.19.3, envoy 1.20.2, and envoy 1.21.1.
Where can I find more information about CVE-2021-43825?
More information about CVE-2021-43825 can be found on the following references: [Red Hat Advisory RHSA-2022:1276](https://access.redhat.com/errata/RHSA-2022:1276), [Red Hat Advisory RHSA-2022:1275](https://access.redhat.com/errata/RHSA-2022:1275), and [CVE-2021-43825](https://access.redhat.com/security/cve/cve-2021-43825).
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