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CVE-2026-102086— Junos OS: SRX Series: Multiple DNS queries processed by SecIntel and DGA in the same session cause a flowd crash

Quick assessment

Affected
Juniper Networks Junos OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Juniper Networks Junos OS 在 SRX 系列设备上的 DNS 插件中存在一个空指针解引用漏洞，允许未经身份验证的、基于网络的攻击者导致服务完全中断（拒绝服务，DoS）。 当在单个流量会话中收到多个 DNS 查询时，若其中一个查询匹配了安全情报（SecIntel）源，而另一个查询用于 DNS 域生成算法（DGA）分析，在处理这些异步任务的日志记录时会出现错误，从而导致 FPC（故障保护控制器）崩溃。精确的时间条件超出了攻击者的直接控制范围。 此问题影响 SRX 系列设备的 Junos OS 以

CVSS 5.9 · Medium

Affected Version Matrix 6

VendorProduct Version RangeStatus
Juniper Networks Junos OS < 23.2R2-S7.7 affected
23.4< 23.4R2-S8.13 affected
24.2< 24.2R2-S5.5 affected
24.4< 24.4R2-S4 affected
25.2< 25.2R2-S1 affected
25.4< 25.4R1-S2 affected
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I. Basic Information for CVE-2026-102086

Vulnerability Information
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Vulnerability Title
Junos OS: SRX Series: Multiple DNS queries processed by SecIntel and DGA in the same session cause a flowd crash
Source: CVE Program / CVE List V5
Vulnerability Description
A NULL Pointer Dereference vulnerability in the DNS plugin of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS). When multiple DNS queries are received in a single flow session, where one query matches a Security Intelligence (SecIntel) feed and another query is sent for DNS Domain Generation Algorithm (DGA) analysis, an error in processing logging of these asynchronous tasks can lead to an FPC crash. The exact timing conditions are outside an attacker's direct control. This issue affects Junos OS on SRX Series: * All versions before 23.2R2-S7.7; * from 23.4 before 23.4R2-S8.13; * from 24.2 before 24.2R2-S5.5; * from 24.4 before 24.4R2-S4; * from 25.2 before 25.2R2-S1; * from 25.4 before 25.4R1-S2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Juniper Networks Junos OS 0 ~ 23.2R2-S7.7 -

II. Public POCs for CVE-2026-102086

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III. Intelligence Information for CVE-2026-102086

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Other References for CVE-2026-102086 (1)

Same Patch Batch · Juniper Networks · 2026-10-14 · 153 CVEs total

CVE-2026-101950 9.8 CRITICAL Junos OS: SRX Series: Malformed IPv4 packets cause packet-forwarding process crash when Se
CVE-2026-101990 9.8 CRITICAL Junos OS and Junos OS Evolved: A BGP peer causes an rpd crash when flow-spec routes are re
CVE-2026-33789 9.8 CRITICAL Junos OS and Junos OS Evolved: With BGP Monitoring Protocol is enabled, receipt of a speci
CVE-2026-33792 9.8 CRITICAL Junos OS: SRX Series: An attacker causes remote code execution and denial of service when
CVE-2026-102182 9.8 CRITICAL Junos OS: MX Series: Certificate-based IKE packets cause root-level code execution
CVE-2026-33796 9.8 CRITICAL Junos OS and Junos OS Evolved: An attacker causes remote root command execution when BMP r
CVE-2026-101956 9.8 CRITICAL Junos OS: Unauthorized root command execution when J-Web is enabled
CVE-2026-101980 9.8 CRITICAL Junos OS: Malformed Extended Echo requests cause a Routing Engine reboot when Extended Ech
CVE-2026-101986 9.8 CRITICAL Junos OS and Junos OS Evolved: J-Web permits pre-authentication CGI execution
CVE-2026-102178 9.8 CRITICAL Junos OS and Junos OS Evolved: When BGP update-threading is enabled a specifically malform
CVE-2026-101982 9.8 CRITICAL Junos OS and Junos OS Evolved: A EVPN peer causes an rpd crash or root-level compromise wh
CVE-2026-101983 9.8 CRITICAL Junos OS and Junos OS Evolved: An attacker causes remote code execution when J-Web virtual
CVE-2026-101954 9.8 CRITICAL Junos OS and Junos OS Evolved: Unauthenticated network access causes full device takeover
CVE-2026-102175 9.8 CRITICAL Junos OS and Junos OS Evolved: An attacker causes remote code execution or denial of servi
CVE-2026-102031 9.8 CRITICAL Junos OS Evolved: A low-privileged TACACS+ user causes root command execution when authori
CVE-2026-102050 8.8 HIGH Junos OS and Junos OS Evolved: An adjacent attacker causes Layer 2 control-plane denial of
CVE-2026-102059 8.8 HIGH Junos OS and Junos OS Evolved: EX Series, SRX Series, QFX Series: A rogue DHCP server caus
CVE-2026-102049 8.8 HIGH Junos OS and Junos OS Evolved: An attacker causes l2cpd crash or root code execution when
CVE-2026-102052 8.8 HIGH Junos OS and Junos OS Evolved: An attacker causes jdhcpd to crash when the DHCPv4 local-cl
CVE-2026-102176 8.8 HIGH Junos OS: Specific packets cause SDK service crash or Routing Engine compromise when the S

Showing top 20 of 153 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-476

V. Comments for CVE-2026-102086

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