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Vulnerabilities

Vulnerability · CVE-2025-21605

Redis is an open source, in-memory database that persists on disk.

Published Apr 23, 2025 · catalog updated Feb 10, 2026 · Redis Redis

Check this week

CVE-2025-21605 is not in CISA KEV. FIRST estimates a 86.00% chance of exploitation in the next 30 days. Check whether you run Redis Redis.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
86.00%
Remediation
Version ranges on file
Affected products
vendor Redis Redis 2.6, < 7.4.3

Redis is an open source, in-memory database that persists on disk. In versions starting at 2.6 and prior to 7.4.3, An unauthenticated client can cause unlimited growth of output buffers, until the server runs out of memory or is killed. By default, the Redis configuration does not limit the output buffer of normal clients (see client-output-buffer-limit). Therefore, the output buffer can grow unlimitedly over time. As a result, the service is exhausted and the memory is unavailable. When password authentication is enabled on the Redis server, but no password is provided, the client can still c

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Redis Redis 2.6, < 7.4.32.6, < 7.4.3

How to fix CVE-2025-21605

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-21605 is not in CISA KEV. FIRST estimates a 86.00% chance of exploitation in the next 30 days. Check whether you run Redis Redis.

Which versions are affected?

Compare what you have installed with Redis Redis 2.6, < 7.4.3 2.6, < 7.4.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 86.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 23, 2025 · EUVD

    Detected

    Redis is an open source, in-memory database that persists on disk. In versions starting at 2.6 and prior to 7.4.3, An unauthenticated client can cause unlimited growth of output buffers, until the server runs out of memory or is killed. By default, the Redis configuration does not limit the output buffer of normal clients (see client-output-buffer-limit). Therefore, the output buffer can grow unli

  2. Feb 10, 2026 · EUVD

    Updated

    Redis is an open source, in-memory database that persists on disk. In versions starting at 2.6 and prior to 7.4.3, An unauthenticated client can cause unlimited growth of output buffers, until the server runs out of memory or is killed. By default, the Redis configuration does not limit the output buffer of normal clients (see client-output-buffer-limit). Therefore, the output buffer can grow unli

Sources

  • CVE.orgVulnerability recordCVE-2025-21605

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-12407

    Redis is an open source, in-memory database that persists on disk. In versions starting at 2.6 and prior to 7.4.3, An unauthenticated client can cause unlimited growth of output buffers, until the server runs out of memory or is killed. By default, the Redis configuration does no

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.