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Fencer Intel
high 7.5

CVE-2021-29477 json

Vulnerability in the STRALGO LCS command

published 5y ago modified 4mo ago also EUVD-2021-16084 , GHSA-vqxj-26vj-996g

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.0%
EPSS 4.0% 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. The problem is fixed in version 6.2.3 and 6.0.13. 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.

Patch / fix

  • redislabs redis 6.0.13, 6.2.3
  • redis Debian 14, Debian 13, Debian 12 5:6.0.13-1

debian advisories DEBIAN-CVE-2021-29477

  • redis RHEL 8 6.0.9-3.module+el8.4.0+10984+ed187465

red hat advisories RHSA-2021:2034

  • redis SLE Module for Server Applications 15 SP3, SLE Module for Server Applications 15 SP2 6.0.13-1.10.1

suse advisories SUSE-SU-2021:1652-1

  • redis openSUSE Tumbleweed 6.2.5-1.2
  • redis openSUSE Leap 15.2 6.0.13-lp152.2.3.1

opensuse advisories openSUSE-SU-2024:11299-1openSUSE-SU-2021:0682-1

  • redis Rocky Linux 8 6.0.9-3.module+el8.4.0+395+8d498eeb

rocky linux advisories RLSA-2021:2034

  • redis Alpine 3.13 6.0.13-r0

alpine advisories ALPINE-CVE-2021-29477

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

Is CVE-2021-29477 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2021-29477 updated cvss 8.8

redis: Integer overflow via STRALGO LCS command

  • Red Hat Advanced Cluster Management for Kubernetes 2 redisgraph-tls-rhel8
    affected: workaround, no fix available “The flaw can be mitigated by disallowing usage of the STRALGO LCS command via ACL configuration. Please see https://redis.io/topics/acl for more information on how to do this.”
  • Red Hat Enterprise Linux AppStream (v. 8) redis 6.0.9-3.module+el8.4.0+10984+ed187465
    fixed: vendor fix “The flaw can be mitigated by disallowing usage of the STRALGO LCS command via ACL configuration. Please see https://redis.io/topics/acl for more information on how to do this.” RHSA-2021:2034
  • 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 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

4.00% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

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-190 Integer Overflow or Wraparound
Technology feeds

References

Sources

Fencer Intel 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.