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CVE-2021-32628

HIGHCVSS 7.5/10EPSS 3.64%

Last modified

CVE-2021-32628 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the ziplist data structure used by all versions of Redis can be exploited to corrupt the heap and potentially result with remote code execution. EPSS estimates a 3.64% chance of exploitation in the next 30 days.

Description

Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the ziplist data structure used by all versions of Redis can be exploited to corrupt the heap and potentially result with remote code execution. The vulnerability involves modifying the default ziplist configuration parameters (hash-max-ziplist-entries, hash-max-ziplist-value, zset-max-ziplist-entries or zset-max-ziplist-value) to a very large value, and then constructing specially crafted commands to create very large ziplists. The problem is fixed in Redis versions 6.2.6, 6.0.16, 5.0.14. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the above configuration parameters. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
3.64%

88.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
RedisRedis>= 5.0.0, < 5.0.14
RedisRedis>= 6.0.0, < 6.0.16
RedisRedis>= 6.2.0, < 6.2.6
FedoraprojectFedora33
FedoraprojectFedora34
FedoraprojectFedora35
DebianDebian Linux10.0
DebianDebian Linux11.0
NetappManagement Services For Element SoftwareAll versions
NetappManagement Services For Netapp HciAll versions
OracleCommunications Operations Monitor4.3
OracleCommunications Operations Monitor4.4
OracleCommunications Operations Monitor5.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-32628?
Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the ziplist data structure used by all versions of Redis can be exploited to corrupt the heap and potentially result with remote code execution. The vulnerability involves modifying the default ziplist configuration parameters (hash-max-ziplist-entries, hash-max-ziplist-value, zset-max-ziplist-entries or zset-max-ziplist-value) to a very large value, and then constructing specially crafted commands to create very large ziplists. The problem is fixed in Redis versions 6.2.6, 6.0.16, 5.0.14. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the above configuration parameters. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.
How severe is CVE-2021-32628?
CVE-2021-32628 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.64% probability of exploitation in the next 30 days.
How do I fix CVE-2021-32628?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST