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CVE-2021-41099

HIGHCVSS 7.5/10EPSS 3.42%

Last modified

CVE-2021-41099 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 underlying string library can be used to corrupt the heap and potentially result with denial of service or remote code execution. EPSS estimates a 3.42% 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 underlying string library can be used to corrupt the heap and potentially result with denial of service or remote code execution. The vulnerability involves changing the default proto-max-bulk-len configuration parameter to a very large value and constructing specially crafted network payloads or commands. 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 proto-max-bulk-len configuration parameter. 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
3.42%

87.4th 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 Software And 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-2021-41099?
Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the underlying string library can be used to corrupt the heap and potentially result with denial of service or remote code execution. The vulnerability involves changing the default proto-max-bulk-len configuration parameter to a very large value and constructing specially crafted network payloads or commands. 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 proto-max-bulk-len configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.
How severe is CVE-2021-41099?
CVE-2021-41099 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.42% probability of exploitation in the next 30 days.
How do I fix CVE-2021-41099?
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.

Are you affected by CVE-2021-41099?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST