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TI-2021-18803 Aliases CVE-2021-42389GHSA-xfh5-vqx3-c7p9

Divide-by-zero in Clickhouse's Delta compression codec when parsing a malicious query.

Priority LOW 31CWE-369Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-369.

Summary

Divide-by-zero in Clickhouse's Delta compression codec when parsing a malicious query. The first byte of the compressed buffer is used in a modulo operation without being checked for 0.

Why it matters now

EPSS 0.01259 69th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed clickhouse (yandex): 21.10.2.15-stable

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Yandexclickhousebefore 21.10.2.15-stable21.10.2.15-stablePatch availableCNA
  • clickhouse VendorYandex Affected before 21.10.2.15-stable Fixed in 21.10.2.15-stable Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*before 21.10.2.15VulnerableClickHouse
  • cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:* Versions before 21.10.2.15 Vulnerable ·ClickHouse

Remediation

  • Fix · CNA clickhouse (yandex) Fixed in 21.10.2.15-stable

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    yandex clickhouse 21.10.2.15-stable

    7 records Highest priority Priority MEDIUM 2 MEDIUM, 5 LOW

    Other records, highest priority first

    • TI-2021-19298 Heap-based buffer overflow in Yandex clickhousePriority MEDIUM 41
    • TI-2021-19297 Heap-based buffer overflow in Yandex clickhousePriority MEDIUM 41
    • TI-2021-18802 Out-of-bounds read in Yandex clickhousePriority LOW 38
    Show all 7 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-42389
  2. 2026-10-03 Alias added: GHSA-xfh5-vqx3-c7p9

References

Exploit 1

  • TI-2023-14000 An issue found in Yandex Navigator v.6.60 for Android allows unauthorized apps to cause… CVSS 3.1HIGH 7.8
  • TI-2023-14001 An issue found in Yandex Navigator v.6.60 for Android allows unauthorized apps to cause a… CVSS 3.1MEDIUM 5.5
  • TI-2021-19298 Heap-based buffer overflow in Yandex clickhouse CVSS 3.1HIGH 8.8
  • TI-2021-19297 Heap-based buffer overflow in Yandex clickhouse CVSS 3.1HIGH 8.8
  • TI-2024-06006 DLL Hijacking in Yandex Browser CVSS 4.0HIGH 8.4
  • TI-2016-08707 Cryptographic flaw in HackerOne tomita-parser node module CVSS 3.0HIGH 8.1
See all 41 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences