CVE-2021-0267— Junos OS: Receipt of a crafted DHCP packet will cause the jdhcpd DHCP service to core.
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I. Basic Information for CVE-2021-0267
Vulnerability Information
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Vulnerability Title
Junos OS: Receipt of a crafted DHCP packet will cause the jdhcpd DHCP service to core.
Source: NVD (National Vulnerability Database)
Vulnerability Description
An Improper Input Validation vulnerability in the active-lease query portion in JDHCPD's DHCP Relay Agent of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) by sending a crafted DHCP packet to the device thereby crashing the jdhcpd DHCP service. This is typically configured for Broadband Subscriber Sessions. Continued receipt and processing of this crafted packet will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS: 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R2. This issue does not affect Junos OS Evolved.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/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和Junos OS Evolved 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS和Junos OS Evolved都是美国瞻博网络（Juniper Networks）公司的产品。Juniper Networks Junos OS是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。Junos OS Evolved是Junos OS 的升级版系统。 Junos OS 存在输入验证错误漏洞，目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
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 | 19.4 ~ 19.4R3-S1 | - |
II. Public POCs for CVE-2021-0267
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Juniper Networks · 2021-04-22 · 53 CVEs total
| CVE-2021-0248 | 10.0 CRITICAL | NFX Series: Hard-coded credentials allow an attacker to take control of any instance throu |
| CVE-2021-0254 | 9.8 CRITICAL | Junos OS: Remote code execution vulnerability in overlayd service |
| CVE-2021-0275 | 8.8 HIGH | Junos OS: J-Web: Cross-site scripting attack allows an attacker to gain control of another |
| CVE-2021-0269 | 8.8 HIGH | Junos OS: J-Web can be compromised through reflected client-side HTTP parameter pollution |
| CVE-2021-0268 | 8.8 HIGH | Junos OS: J-Web has an Improper Neutralization of CRLF Sequences in its HTTP Headers which |
| CVE-2021-0251 | 8.6 HIGH | Junos OS: MX Series with MS-PIC, MS-SPC3, MS-MIC or MS-MPC: The BRAS Subscriber Services s |
| CVE-2021-0249 | 8.1 HIGH | Junos OS: SRX Series: A remote attacker may be able to cause a PFE buffer overflow to arbi |
| CVE-2021-0266 | 8.1 HIGH | cSRX: Use of Hard-coded Cryptographic Keys allows an attacker to take control of the devic |
| CVE-2021-0265 | 8.1 HIGH | Contrail Insights: The REST API implementation allows an unauthenticated remote attacker t |
| CVE-2021-0245 | 7.8 HIGH | Junos OS: Junos Fusion: Hard-coded credentials on satellite devices allows a locally authe |
| CVE-2021-0252 | 7.8 HIGH | Junos OS: NFX Series: Local Code Execution Vulnerability in JDMD Leads to Privilege Escala |
| CVE-2021-0253 | 7.8 HIGH | Junos OS: NFX Series: Local Command Execution Vulnerability in JDMD Leads to Privilege Esc |
| CVE-2021-0250 | 7.5 HIGH | Junos OS and Junos OS Evolved: An attacker sending a specific crafted BGP update message w |
| CVE-2021-0261 | 7.5 HIGH | Junos OS: Denial of Service vulnerability in J-Web and web based (HTTP/HTTPS) services cau |
| CVE-2021-0227 | 7.5 HIGH | Junos OS: SRX Series: Denial of Service in J-Web upon receipt of crafted HTTP packets |
| CVE-2021-0270 | 7.5 HIGH | Junos OS: PTX Series, QFX10K Series: A PTX/QFX FPC may restart unexpectedly with the "inli |
| CVE-2021-0230 | 7.5 HIGH | Junos OS: SRX Series: Memory leak when querying Aggregated Ethernet (AE) interface statist |
| CVE-2021-0233 | 7.5 HIGH | Junos OS: ACX500 Series, ACX4000 Series: Denial of Service due to FFEB crash while process |
| CVE-2021-0244 | 7.4 HIGH | Junos OS: A race condition in the storm control profile may allow an attacker to cause a D |
| CVE-2021-0259 | 7.4 HIGH | Junos OS and Junos OS Evolved: QFX5K Series: Underlay network traffic might not be process |
Showing top 20 of 53 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-2021-0267
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