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CVE-2021-32765 (GCVE-0-2021-32765)

Vulnerability from cvelistv5 – Published: 2021-10-04 00:00 – Updated: 2024-08-03 23:33
VLAI
Title
Integer Overflow to Buffer Overflow in Hiredis
Summary
Hiredis is a minimalistic C client library for the Redis database. In affected versions Hiredis is vulnurable to integer overflow if provided maliciously crafted or corrupted `RESP` `mult-bulk` protocol data. When parsing `multi-bulk` (array-like) replies, hiredis fails to check if `count * sizeof(redisReply*)` can be represented in `SIZE_MAX`. If it can not, and the `calloc()` call doesn't itself make this check, it would result in a short allocation and subsequent buffer overflow. Users of hiredis who are unable to update may set the [maxelements](https://github.com/redis/hiredis#reader-max-array-elements) context option to a value small enough that no overflow is possible.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-190 - Integer Overflow or Wraparound
  • CWE-680 - Integer Overflow to Buffer Overflow
Assigner
References
Impacted products
Vendor Product Version CPE status
redis hiredis Affected: < 1.0.1
guessed Create a notification for this product.
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-03T02:07:44+00:00",
      "cve": "CVE-2021-32765",
      "id": "CVE-2021-32765",
      "initial_release_date": "2021-10-04T00:00:00+00:00",
      "product_status:known_not_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "hiredis: an integer overflow may occur if provided maliciously crafted or corrupted RESP mult-bulk protocol data",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-32765.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2025-03-15T08:53:23Z",
      "cve": "CVE-2021-32765",
      "id": "CVE-2021-32765",
      "initial_release_date": "2023-02-15T03:40:50Z",
      "product_status:recommended": "15",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-32765",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-32765.json",
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}



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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.