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CVE-2023-29451Denial of service caused by a bug in the JSON parser

Description

Specially crafted string can cause a buffer overrun in the JSON parser library leading to a crash of the Zabbix Server or a Zabbix Proxy.

Timeline

  1. ID reserved

    By Zabbix

  2. · 3 months later

    Published

  3. · 19 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2023-29451, by who scored it
Scored byCVSSScoreVector
ZabbixCNA (assigner)3.1Medium4.7CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
NVDNVD · Modified3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.78% · top 43% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.7.

Affected products

  • Zabbix · Zabbix

    • affected 6.0 – ≤ 6.0.14
    • affected 6.2 – ≤ 6.2.8
    • affected 6.4 – ≤ 6.4.0
    • affected 7.0.0alpha1 – ≤ 7.0.0alpha1

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .