CVE-2026-21917— Junos OS: SRX Series: Specifically malformed SSL packet causes FPC crash
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I. Basic Information for CVE-2026-21917
Vulnerability Information
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Vulnerability Title
Junos OS: SRX Series: Specifically malformed SSL packet causes FPC crash
Source: NVD (National Vulnerability Database)
Vulnerability Description
An Improper Validation of Syntactic Correctness of Input vulnerability in the Web-Filtering 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 device configured for UTM Web-Filtering receives a specifically malformed SSL packet, this will cause an FPC crash and restart. This issue affects Junos OS on SRX Series: * 23.2 versions from 23.2R2-S2 before 23.2R2-S5, * 23.4 versions from 23.4R2-S1 before 23.4R2-S5, * 24.2 versions before 24.2R2-S2, * 24.4 versions before 24.4R1-S3, 24.4R2. Earlier versions of Junos are also affected, but no fix is available.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1286
Source: NVD (National Vulnerability Database)
Vulnerability Title
Juniper Networks Junos OS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS 23.2R2-S5之前版本、23.4R2-S5之前版本、24.2R2-S2之前版本、24.4R1-S3和24.4R2之前版本存在安全漏洞，该漏洞源于Web过滤模块存在输入语法正确性验证不当，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Juniper Networks | Junos OS | 23.2R2-S2 ~ 23.2R2-S5 | - |
II. Public POCs for CVE-2026-21917
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|---|
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Same Patch Batch · Juniper Networks · 2026-01-15 · 23 CVEs total
| CVE-2026-21913 | 7.5 HIGH | Junos OS: EX4000: A high volume of traffic destined to the device leads to a crash and res |
| CVE-2026-21920 | 7.5 HIGH | Junos OS: SRX Series: If a specific request is processed by the DNS subsystem flowd will c |
| CVE-2025-60003 | 7.5 HIGH | Junos OS and Junos OS Evolved: BGP update with a set of specific attributes causes rpd cra |
| CVE-2026-21918 | 7.5 HIGH | Junos OS: SRX and MX Series: When TCP packets occur in a specific sequence flowd crashes |
| CVE-2026-21914 | 7.5 HIGH | Junos OS: SRX Series: A specifically malformed GTP message will cause an FPC crash |
| CVE-2026-21905 | 7.5 HIGH | Junos OS: SRX Series, MX Series with MX-SPC3 or MS-MPC: Receipt of multiple specific SIP m |
| CVE-2026-21906 | 7.5 HIGH | Junos OS: SRX Series: With GRE performance acceleration enabled, receipt of a specific ICM |
| CVE-2025-59960 | 7.4 HIGH | Junos OS and Junos OS Evolved: DHCP Option 82 messages from clients being passed unmodifie |
| CVE-2026-21908 | 7.1 HIGH | Junos OS and Junos OS Evolved: Use after free vulnerability In 802.1X authentication daemo |
| CVE-2026-21903 | 6.5 MEDIUM | Junos OS: Subscribing to telemetry sensors at scale causes all FPCs to crash |
| CVE-2026-21911 | 6.5 MEDIUM | Junos OS Evolved: Flapping management interface causes MAC learning on label-switched inte |
| CVE-2026-21910 | 6.5 MEDIUM | Junos OS: EX4k Series, QFX5k Series: In an EVPN-VXLAN configuration link flaps cause Inter |
| CVE-2026-21909 | 6.5 MEDIUM | Junos OS and Junos OS Evolved: Receipt of specific IS-IS update packet causes memory leak |
| CVE-2026-0203 | 6.5 MEDIUM | Junos OS: Receipt of a specifically malformed ICMP packet causes an FPC restart |
| CVE-2026-21921 | 6.5 MEDIUM | Junos OS and Junos OS Evolved: When telemetry collectors are frequently subscribing and un |
| CVE-2025-52987 | 6.1 MEDIUM | Paragon Automation: A clickjacking vulnerability in the web server configuration has been |
| CVE-2026-21907 | 5.9 MEDIUM | Junos Space: TLS/SSL server supports use of static key ciphers (ssl-static-key-ciphers) |
| CVE-2025-60011 | 5.8 MEDIUM | Junos OS and Junos OS Evolved: Optional transitive BGP attribute is modified before propag |
| CVE-2026-21912 | 5.5 MEDIUM | Junos OS: MX10k Series: 'show system firmware' CLI command may lead to LC480 or LC2101 lin |
| CVE-2025-60007 | 5.5 MEDIUM | Junos OS: A specifically crafted 'show chassis' command causes chassisd to crash |
Showing top 20 of 23 CVEs. View all on vendor page → →
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