HIGH🇵🇱 Wersja polska

CVE-2026-21920

CVSS 8.7v4.0pub. 2026-01-15upd. 2026-01-23

An Unchecked Return Value vulnerability in the DNS module of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). If an SRX Series device configured for DNS processing, receives a specifically formatted DNS request flowd will crash and restart, which causes a service interruption until the process has recovered. This issue affects Junos OS on SRX Series: * 23.4 versions before 23.4R2-S5, * 24.2 versions before 24.2R2-S1, * 24.4 versions before 24.4R2. This issue does not affect Junos OS versions before 23.4R1.

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:X/RE:M/U:X

  • Juniper Junos

    OS
    Juniper
    23.424.224.4

  • Juniper Srx1500

    HW
    Juniper
    all versions

  • Juniper Srx1600

    HW
    Juniper
    all versions

  • Juniper Srx2300

    HW
    Juniper
    all versions

  • Juniper Srx300

    HW
    Juniper
    all versions

  • Juniper Srx320

    HW
    Juniper
    all versions

  • Juniper Srx340

    HW
    Juniper
    all versions

  • Juniper Srx345

    HW
    Juniper
    all versions

  • Juniper Srx380

    HW
    Juniper
    all versions

  • Juniper Srx4100

    HW
    Juniper
    all versions

  • Juniper Srx4120

    HW
    Juniper
    all versions

  • Juniper Srx4200

    HW
    Juniper
    all versions

  • Juniper Srx4300

    HW
    Juniper
    all versions

  • Juniper Srx4600

    HW
    Juniper
    all versions

  • Juniper Srx4700

    HW
    Juniper
    all versions

  • Juniper Srx5400

    HW
    Juniper
    all versions

  • Juniper Srx5600

    HW
    Juniper
    all versions

  • Juniper Srx5800

    HW
    Juniper
    all versions
🔵
CHECK WITH VENDOR
No clear patch data available. Check vendor references.
CWE
References

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