CVE-2025-32023: 
Redis vulnerability analysis and mitigation

Redis, an open source in-memory database, has been found to contain a critical vulnerability (CVE-2025-32023) affecting versions from 2.8 to before 8.0.3, 7.4.5, 7.2.10, and 6.2.19. The vulnerability was discovered on July 7, 2025, and allows an authenticated user to trigger a stack/heap out-of-bounds write on hyperloglog operations, potentially leading to remote code execution (Redis Advisory).

The vulnerability is classified as an Integer Overflow to Buffer Overflow (CWE-680) with a CVSS v3.1 base score of 7.0 (High). The attack vector is Local (AV:L), with High attack complexity (AC:H), requiring Low privileges (PR:L), and No user interaction (UI:N). The scope is Unchanged (S:U), with High impact on Confidentiality, Integrity, and Availability (C:H/I:H/A:H) (Redis Advisory).

The vulnerability allows authenticated users to potentially execute remote code through specially crafted strings that trigger stack/heap out-of-bounds write operations. This affects all Redis versions with hyperloglog operations implemented, potentially compromising system security and data integrity (Redis Advisory).

The vulnerability has been patched in Redis versions 8.0.3, 7.4.5, 7.2.10, and 6.2.19. For users unable to immediately update, a workaround is available by preventing users from executing hyperloglog operations using ACL to restrict HLL commands (Redis Advisory, Redis Release).

The vulnerability has been treated as a high-priority security issue, with Redis promptly releasing patches across multiple version branches. Red Hat has classified this as an Important security update and included fixes in their enterprise Linux distributions (Red Hat Advisory).