CVE-2025-21605
Redis DoS Vulnerability due to unlimited growth of output buffers abused by unauthenticated client
02 Description
Redis DoS Vulnerability due to unlimited growth of output buffers abused by unauthenticated client
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.87% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 58.5% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2025-04-23 15:38Z1 YR AGO
- Last updated
- 2026-02-10 17:06Z8 MO AGO
- Reserved
- 2024-12-29
- Assigning CNA
- GitHub_M
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-770Allocation of Resources Without Limits or ThrottlingBase
- Data version
- 5.2
- Document digest
- 66169b3394f8a803313823526f6c09f46678cac2eb3381a5e13b9ef6d0f351ac
05 Affected products
06 References
- github.comhttps://github.com/redis/redis/security/advisories/GHSA-r67f-p999-2gff
- github.comhttps://github.com/redis/redis/releases/tag/7.4.3
- lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/05/msg00014.html
- github.comhttps://github.com/valkey-io/valkey/releases/tag/8.1.1
- www.vicarius.iohttps://www.vicarius.io/vsociety/posts/cve-2025-21605-detection-script-memory-exhaustion-vulnerability-in-redis-database
- www.vicarius.iohttps://www.vicarius.io/vsociety/posts/cve-2025-21605-mitigation-script-memory-exhaustion-vulnerability-in-redis-database
07 Fixed in
AlmaLinux 8
- redis Fixed in 6.2.18-1.module_el8.10.0+3994+c2cc5395
- redis-devel Fixed in 6.2.18-1.module_el8.10.0+3994+c2cc5395
- redis-doc Fixed in 6.2.18-1.module_el8.10.0+3994+c2cc5395
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- redis Fixed
A version is affected if any line below covers it.
- Affected before 6.2.18-1.el9_6
- Affected before 7.2.8-1.module_el9.6.0+168+b8d8e900
- redis-devel Fixed
A version is affected if any line below covers it.
- Affected before 6.2.18-1.el9_6
- Affected before 7.2.8-1.module_el9.6.0+168+b8d8e900
- redis-doc Fixed
A version is affected if any line below covers it.
- Affected before 6.2.18-1.el9_6
- Affected before 7.2.8-1.module_el9.6.0+168+b8d8e900
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- valkey Fixed in 8.0.3-1.el10_0
- valkey-devel Fixed in 8.0.3-1.el10_0
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- redis Fixed in 6.2.18-1.module_el8.10.0+3994+c2cc5395
- redis-devel Fixed in 6.2.18-1.module_el8.10.0+3994+c2cc5395
- redis-doc Fixed in 6.2.18-1.module_el8.10.0+3994+c2cc5395
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- redis Fixed
A version is affected if any line below covers it.
- Affected before 6.2.18-1.el9_6
- Affected before 7.2.8-1.module_el9.6.0+168+b8d8e900
- redis-devel Fixed
A version is affected if any line below covers it.
- Affected before 6.2.18-1.el9_6
- Affected before 7.2.8-1.module_el9.6.0+168+b8d8e900
- redis-doc Fixed
A version is affected if any line below covers it.
- Affected before 6.2.18-1.el9_6
- Affected before 7.2.8-1.module_el9.6.0+168+b8d8e900
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- valkey Fixed in 8.0.3-1.el10_0
- valkey-devel Fixed in 8.0.3-1.el10_0
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- redis Fixed in 5:7.0.15-1~deb12u4
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- redis Fixed in 5:7.0.15-3.1
- valkey Fixed in 8.1.1+dfsg1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- redict Fixed in 7.3.5+ds-1
- redis Fixed in 5:7.0.15-3.1
- valkey Fixed in 8.1.1+dfsg1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- redis No fix yet
- valkey Fixed in 7.2.11+dfsg1-0ubuntu0.2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- redict No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- redict No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.10
- redict No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- redis No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- redis No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- redis No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- redis No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 22.04 LTS
- redis No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.