CVE-2021-32762
Integer overflow that can lead to heap overflow in redis-cli, redis-sentinel on some platforms
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.
How to fix CVE-2021-32762
To remediate CVE-2021-32762, upgrade the affected package to a fixed version below.
- —upgrade to 5.0.14-r0 or later
- —upgrade to 5.0.14 or later
- —upgrade to 5.0.14 or later
- —upgrade to 5.0.14 or later
- —upgrade to 5:6.0.16-1+deb11u1 or later
Is CVE-2021-32762 being exploited?
Low — EPSS is 0.9%, meaning exploitation activity has not been observed at scale.
Affected packages (5)
- from 0, < 5.0.14-r0
- >= 5.0.0, < 5.0.14, >= 6.0.0, < 6.0.16, >= 6.2.0, < 6.2.6
- >= 5.0.0, < 5.0.14, >= 6.0.0, < 6.0.16, >= 6.2.0, < 6.2.6
- >= 5.0.0, < 5.0.14, >= 6.0.0, < 6.0.16, >= 6.2.0, < 6.2.6
- from 0, < 5:6.0.16-1+deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |