CVE-2021-32687 Integer overflow issue with intsets in Redis
Integer overflow in Redis intsets allows heap corruption, potentially leading to remote code execution or data leakage when specific configuration parameters are modified.
- 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-2021-32687?
CVE-2021-32687 is a high-severity vulnerability in Debian Debian Linux, published on 4 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Redis is an open source, in-memory database that persists on disk. An integer overflow bug affecting all versions of Redis can be exploited to corrupt the heap and potentially be used to leak arbitrary contents of the heap or trigger remote code execution. The vulnerability involves changing the default set-max-intset-entries configuration parameter to a very large value and constructing specially crafted commands to manipulate sets. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the set-max-intset-entries configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.
Which versions are affected by CVE-2021-32687?
3 open source packages ship an affected version, including keydb, redis and valkey. It affects 6 products.
| Package | Affected | Fixed in |
|---|---|---|
keydb Bitnami | From 5.0.0 | 5.0.14, 6.0.16, 6.2.6 |
redis Bitnami | From 5.0.0 | 5.0.14, 6.0.16, 6.2.6 |
valkey Bitnami | From 5.0.0 | 5.0.14, 6.0.16, 6.2.6 |
Products include Debian Debian Linux, Fedoraproject Fedora, Netapp Management Services for Element Software, Netapp Management Services for Netapp Hci, Oracle Communications Operations Monitor, Redis Redis.
How do I fix CVE-2021-32687?
Upgrade keydb to a fixed version for your release line: 5.0.14, 6.0.16 or 6.2.6.
Is CVE-2021-32687 being exploited?
There is no known exploitation of CVE-2021-32687 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2021-32687, AZL-6849, BIT-keydb-2021-32687, BIT-redis-2021-32687, BIT-valkey-2021-32687, CLEANSTART-2026-YM18957 and 3 more.