CVE-2021-31376— Junos OS: ACX Series: Packet Forwarding Engine manager (FXPC) process crashes when processing DHCPv6 packets
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I. Basic Information for CVE-2021-31376
Vulnerability Information
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Vulnerability Title
Junos OS: ACX Series: Packet Forwarding Engine manager (FXPC) process crashes when processing DHCPv6 packets
Source: NVD (National Vulnerability Database)
Vulnerability Description
An Improper Input Validation vulnerability in Packet Forwarding Engine manager (FXPC) process of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) by sending specific DHCPv6 packets to the device and crashing the FXPC service. Continued receipt and processing of this specific packet will create a sustained Denial of Service (DoS) condition. This issue affects only the following platforms in ACX Series: ACX500, ACX1000, ACX1100, ACX2100, ACX2200, ACX4000, ACX5048, ACX5096 devices. Other ACX platforms are not affected from this issue. This issue affects Juniper Networks Junos OS on ACX500, ACX1000, ACX1100, ACX2100, ACX2200, ACX4000, ACX5048, ACX5096: 18.4 version 18.4R3-S7 and later versions prior to 18.4R3-S8. This issue does not affect: Juniper Networks Junos OS 18.4 versions prior to 18.4R3-S7 on ACX500, ACX1000, ACX1100, ACX2100, ACX2200, ACX4000, ACX5048, ACX5096.
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
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Juniper Networks Junos OS 输入验证错误漏洞
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存在输入验证错误漏洞，该漏洞源于Junos OS 的数据包转发引擎管理器 (FXPC) 进程中存在一个不正确的输入验证漏洞，允许攻击者通过向设备发送特定的 DHCPv6 数据包并使 FXPC 服务崩溃来导致拒绝服务 (DoS)。
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 | 18.4 ~ 18.4R3-S7 | - |
II. Public POCs for CVE-2021-31376
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|---|
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Same Patch Batch · Juniper Networks · 2021-10-19 · 42 CVEs total
| CVE-2021-31349 | 9.8 CRITICAL | Session Smart Router: Authentication Bypass Vulnerability |
| CVE-2021-31385 | 8.8 HIGH | Junos OS: J-Web: A path traversal vulnerability allows an authenticated attacker to elevat |
| CVE-2021-31372 | 8.8 HIGH | Junos OS: J-Web allows a locally authenticated attacker to escalate their privileges to ro |
| CVE-2021-31355 | 8.0 HIGH | Junos OS: Stored Cross-Site Scripting (XSS) vulnerability in captive portal |
| CVE-2021-31373 | 8.0 HIGH | Junos OS: SRX Series: Persistent XSS vulnerability in J-Web |
| CVE-2021-31356 | 7.8 HIGH | Junos OS Evolved: Multiple shell-injection vulnerabilities in EVO UI wrapper scripts |
| CVE-2021-31357 | 7.8 HIGH | Junos OS Evolved: shell-injection vulnerabilities in evo_tcpdump UI wrapper script |
| CVE-2021-31358 | 7.8 HIGH | Junos OS Evolved: shell-injection vulnerabilities in evo_sftp UI wrapper script |
| CVE-2021-31359 | 7.8 HIGH | Junos OS and Junos OS Evolved: Local Privilege Escalation vulnerability |
| CVE-2021-31350 | 7.5 HIGH | Junos OS and Junos OS Evolved: Privilege escalation vulnerability in Juniper Extension Too |
| CVE-2021-31351 | 7.5 HIGH | Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset |
| CVE-2021-31379 | 7.5 HIGH | Junos OS: MX Series: MPC 7/8/9/10/11 cards with MAP-E: PFE halts when an attacker sends ma |
| CVE-2021-31353 | 7.5 HIGH | Junos OS and Junos OS Evolved: RPD core upon receipt of specific BGP update |
| CVE-2021-31374 | 7.5 HIGH | Junos OS and Junos OS Evolved: RPD crash while processing a specially crafted BGP UPDATE o |
| CVE-2021-31383 | 7.5 HIGH | Junos OS and Junos OS Evolved: In Point to MultiPoint (P2MP) scenarios receipt of various |
| CVE-2021-0299 | 7.5 HIGH | Junos OS: Kernel crash (vmcore) upon receipt of a malformed IPv6 packet |
| CVE-2021-31368 | 7.5 HIGH | Junos OS: EX2300 Series, EX3400 Series, and ACX710 might become unresponsive if the out-of |
| CVE-2021-0296 | 7.4 HIGH | CTPView: HSTS not being enforced on CTPView server. |
| CVE-2021-31384 | 7.2 HIGH | Junos OS: SRX Series: Under a specific device configuration an attacker can access the dev |
| CVE-2021-31375 | 7.2 HIGH | Junos OS: Receipt of a specific BGP update may cause RPKI policy-checks to be bypassed |
Showing top 20 of 42 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Junos OS
- CVE-2026-33791
Junos OS and Junos OS Evolved: Execution of crafted CLI comm - CVE-2026-33790
Junos OS: SRX Series: In a NAT64 configuration, receipt of a - CVE-2026-33787
Junos OS: SRX1500, SRX4100, SRX4200, SRX4600: When a specifi - CVE-2026-33785
Junos OS: MX Series: Missing Authorization for specific 'req - CVE-2026-33781
Junos OS: EX Series, QFX Series: In a VXLAN scenario when sp
Same vendor: Juniper Networks
- CVE-2026-33791
Junos OS and Junos OS Evolved: Execution of crafted CLI comm - CVE-2026-33790
Junos OS: SRX Series: In a NAT64 configuration, receipt of a - CVE-2026-33787
Junos OS: SRX1500, SRX4100, SRX4200, SRX4600: When a specifi - CVE-2026-33785
Junos OS: MX Series: Missing Authorization for specific 'req - CVE-2026-33784
JSI Virtual Lightweight Collector: Default password is not r
Same weakness: CWE-20
V. Comments for CVE-2021-31376
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