{"cve":"CVE-2026-33799","nvd":{"published":"2026-07-09T21:16:54.963","modified":"2026-07-13T12:55:46.097","status":"Analyzed","description":"An Out-of-bounds Write vulnerability in the SNMP daemon (snmpd) of Juniper Networks Junos OS and Junos OS Evolved allows an authenticated network-based attacker sending specific valid SNMPv3 queries to trigger a memory leak. Over time, continuous receipt of these queries will result in snmpd process memory exhaustion, resulting in a process crash and restart, impacting the ability to monitor the system via SNMP.\n\nMemory usage can be monitored using the following command:\n\nuser@device> show system processes extensive | match snmpd\n\n\n\n\nThis issue affects:\n\nJunos OS:\n\n\n  *  all versions before 21.2R3-S8;\n  *  from 21.4 before 21.4R3-S7;\n  *  from 22.1 before 22.1R3-S6;\n  *  from 22.2 before 22.2R3-S4;\n  *  from 22.3 before 22.3R3-S3;\n  *  from 22.4 before 22.4R3-S2;\n  *  from 23.2 before 23.2R2;\n  *  from 23.4 before 23.4R2.\n\n\n\nJunos OS Evolved:\n  *  all versions before 21.2R3-S8-EVO;\n  *  from 21.4 before 21.4R3-S7-EVO;\n  *  all versions of 22.1-EVO,\n  *  from 22.2 before 22.2R3-S4-EVO;\n  *  from 22.3 before 22.3R3-S3-EVO;\n  *  all versions of 22.4-EVO,\n  *  from 23.2 before 23.2R2-EVO;\n  *  from 23.4 before 23.4R2-EVO.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/AU:Y/R:A/V:C/RE:M/U:Green","score":5.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","score":4.3},"cwes":["CWE-787"],"references":["https://supportportal.juniper.net/JSA110074"],"products":["juniper:junos","juniper:junos_os_evolved"],"source":"nvd","synced_at":"2026-10-19T22:44:02.134301115+00:00"},"epss":{"cve":"CVE-2026-33799","score":0.00367,"percentile":0.30597,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}