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Fencer Vulns
high 7.5

CVE-2021-32625 json

Redis vulnerability in STRALGO LCS on 32-bit systems

published 2021-06-01 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19456 , GHSA-46cp-x4x9-6pfq

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.1%
EPSS 4.1% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache, and message broker. An integer overflow bug in Redis version 6.0 or newer, could be exploited using the STRALGO LCS command to corrupt the heap and potentially result with remote code execution. This is a result of an incomplete fix by CVE-2021-29477. The problem is fixed in version 6.2.4 and 6.0.14. An additional workaround to mitigate the problem without patching the redis-server executable is to use ACL configuration to prevent clients from using the STRALGO LCS command. On 64 bit systems which have the fixes of CVE-2021-29477 (6.2.3 or 6.0.13), it is sufficient to make sure that the proto-max-bulk-len config parameter is smaller than 2GB (default is 512MB).

Patch / fix

  • redislabs redis 6.0.14, 6.2.4
  • redis Debian 14, Debian 13, Debian 12 5:6.0.14-1

debian advisories DEBIAN-CVE-2021-32625

  • redis SLE Module for Server Applications 15 SP3, SLE Module for Server Applications 15 SP2 6.0.14-6.5.1

suse advisories SUSE-SU-2021:2294-1

  • redis openSUSE Tumbleweed 6.2.5-1.2
  • redis openSUSE Leap 15.3 6.0.14-6.5.1
  • redis openSUSE Leap 15.2 6.0.14-lp152.2.6.1

opensuse advisories openSUSE-SU-2024:11299-1openSUSE-SU-2021:2294-1openSUSE-SU-2021:0841-1

  • redis Alpine 3.13 6.0.14-r0
  • redis Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 6.2.4-r0

alpine advisories ALPINE-CVE-2021-32625

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-32625 updated cvss 8.8

redis: Heap corruption via `STRALGO LCS` command (Incomplete fix for CVE-2021-29477)

  • Red Hat Advanced Cluster Management for Kubernetes 2 redisgraph-tls Red Hat Ansible Automation Platform 1.2 redis Red Hat Ansible Tower 3 redis Red Hat Enterprise Linux 8 redis Red Hat Enterprise Linux 9 redis Red Hat OpenStack Platform 10 (Newton) redis
    +1 more products
    Red Hat OpenStack Platform 13 (Queens) redis
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.14% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Affected products

  • redis redis

Classification

Weakness
  • CWE-680 Integer Overflow to Buffer Overflow
  • CWE-190 Integer Overflow or Wraparound
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of redis/redis published their own advisory on GitHub. Reviewed sources take precedence over it.