CVE-2021-32761
A vulnerability involving out-of-bounds read and integer overflow to buffer overflow exists starting with version 2.2 and prior to versions 5.0.13, 6.0.15, and 6.2.5.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 36.6%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
Description
Redis is an in-memory database that persists on disk. A vulnerability involving out-of-bounds read and integer overflow to buffer overflow exists starting with version 2.2 and prior to versions 5.0.13, 6.0.15, and 6.2.5. On 32-bit systems, Redis `*BIT*` command are vulnerable to integer overflow that can potentially be exploited to corrupt the heap, leak arbitrary heap contents or trigger remote code execution. The vulnerability involves changing the default `proto-max-bulk-len` configuration parameter to a very large value and constructing specially crafted commands bit commands. This problem only affects Redis on 32-bit platforms, or compiled as a 32-bit binary. Redis versions 5.0.`3m 6.0.15, and 6.2.5 contain patches for this issue. An additional workaround to mitigate the problem without patching the `redis-server` executable is to prevent users from modifying the `proto-max-bulk-len` configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 36.55% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125, CWE-680, CWE-190
- Affected
- redislabs/redis · debian/debian linux · fedoraproject/fedora
- Source
- security-advisories@github.com
EPSS moved from 37.6% on 20 September 2026 to 36.6% on 26 October 2026, peaking at 37.8% on 23 September 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- https://github.com/redis/redis/security/advisories/GHSA-8wxq-j7rp-g8wjThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/07/msg00017.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/08/msg00026.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6O7AUOROBYGP5IMGJPC5HZ3R2RB6GZ5X/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VGX7RRAWGXWXEAKJTQYSDSBO2BC3SAHD/
- https://security.gentoo.org/glsa/202209-17Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210827-0004/Third Party Advisory
- https://www.debian.org/security/2021/dsa-5001Third Party Advisory
- https://github.com/redis/redis/security/advisories/GHSA-8wxq-j7rp-g8wjThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/07/msg00017.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/08/msg00026.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6O7AUOROBYGP5IMGJPC5HZ3R2RB6GZ5X/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VGX7RRAWGXWXEAKJTQYSDSBO2BC3SAHD/
- https://security.gentoo.org/glsa/202209-17Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210827-0004/Third Party Advisory
- https://www.debian.org/security/2021/dsa-5001Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.