PT-2021-19914 · Hiredis+4 · Hiredis+4

Published 2021-10-04 · Updated 2024-06-15 · CVE-2021-32765

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Hiredis (affected versions not specified)

Description The issue arises from an integer overflow when Hiredis is provided with maliciously crafted or corrupted RESP mult-bulk protocol data. Specifically, when parsing multi-bulk (array-like) replies, Hiredis fails to check if count * sizeof(redisReply*) can be represented in SIZE MAX, potentially leading to a short allocation and subsequent buffer overflow due to the calloc() call not making this check.

Recommendations For all affected versions, users who are unable to update may set the maxelements context option to a value small enough that no overflow is possible. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Integer Overflow

Weakness Enumeration

CWE-190

CWE-680

Related Identifiers

ALT-PU-2022-1589

ALT-PU-2022-1669

BDU:2025-04141

CVE-2021-32765

DLA-2783-1

GHSA-HFM9-39PP-55P2

MGASA-2021-0562

OESA-2021-1390

OPENSUSE-SU-2021:1536-1

OPENSUSE-SU-2021:1550-1

OPENSUSE-SU-2021_1536-1

OPENSUSE-SU-2024:11561-1

ROSA-SA-2024-2336

ROSA-SA-2024-2337

Affected Products

Alt Linux

Astra Linux

Debian

Hiredis

Suse

References · 33

• https://github.com/redis/hiredis/commit/76a7b10005c70babee357a7d0f2becf28ec7ed1e · Patch
• https://bdu.fstec.ru/vul/2025-04141 · Security Note
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2025-0319SE17 · Vendor Advisory
• https://security.gentoo.org/glsa/202210-32 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:11561-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-32765 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2021-1390 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-32765 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-32765 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2021:1536-1 · Vendor Advisory
• https://debian.org/lts/security/2021/dla-2783 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-32765 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2021-0562.html · Security Note
• https://cve.org/CVERecord?id=CVE-2021-32765 · Security Note
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2025-0422SE79 · Vendor Advisory