CVE-2021-29469 Potential exponential regex in monitor mode
An attacker can cause a denial of service via exponential regex backtracking when the client is in monitoring mode.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-29469?
CVE-2021-29469 is a medium-severity denial of service vulnerability in NodeRedis node-redis, published on 23 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Node-redis is a Node.js Redis client. Before version 3.1.1, when a client is in monitoring mode, the regex begin used to detected monitor messages could cause exponential backtracking on some strings. This issue could lead to a denial of service. The issue is patched in version 3.1.1.
Weakness: CWE-400
Which versions are affected by CVE-2021-29469?
2 open source packages ship an affected version, including redis. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
redis npm | From 2.6.0 | 3.1.1 |
redis npm | From 2.6.0 | 3.1.1 |
Products include Redis.js Redis.
How do I fix CVE-2021-29469?
Upgrade redis to 3.1.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-29469 being exploited?
There is no known exploitation of CVE-2021-29469 in the wild and no public exploit code.
Sources
Also known as CLSA-2026-1776818209, DEBIAN-CVE-2021-29469, GHSA-35q2-47q7-3pc3, UBUNTU-CVE-2021-29469.