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CVE-2021-32762

HIGHCVSS 8.8/10EPSS 2.50%

Last modified

CVE-2021-32762 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Redis is an open source, in-memory database that persists on disk. The redis-cli command line tool and redis-sentinel service may be vulnerable to integer overflow when parsing specially crafted large multi-bulk network replies. EPSS estimates a 2.50% chance of exploitation in the next 30 days.

Description

Redis is an open source, in-memory database that persists on disk. The redis-cli command line tool and redis-sentinel service may be vulnerable to integer overflow when parsing specially crafted large multi-bulk network replies. This is a result of a vulnerability in the underlying hiredis library which does not perform an overflow check before calling the calloc() heap allocation function. This issue only impacts systems with heap allocators that do not perform their own overflow checks. Most modern systems do and are therefore not likely to be affected. Furthermore, by default redis-sentinel uses the jemalloc allocator which is also not vulnerable. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14.

Metrics

CVSS 3.1
8.8/10

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

EPSS Probability
2.50%

82.7th 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
DebianDebian Linux10.0
DebianDebian Linux11.0
FedoraprojectFedora33
FedoraprojectFedora34
FedoraprojectFedora35
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-2021-32762?
Redis is an open source, in-memory database that persists on disk. The redis-cli command line tool and redis-sentinel service may be vulnerable to integer overflow when parsing specially crafted large multi-bulk network replies. This is a result of a vulnerability in the underlying hiredis library which does not perform an overflow check before calling the calloc() heap allocation function. This issue only impacts systems with heap allocators that do not perform their own overflow checks. Most modern systems do and are therefore not likely to be affected. Furthermore, by default redis-sentinel uses the jemalloc allocator which is also not vulnerable. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14.
How severe is CVE-2021-32762?
CVE-2021-32762 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.50% probability of exploitation in the next 30 days.
How do I fix CVE-2021-32762?
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-2021-32762?

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

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Source: NVD / NIST