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CVE-2021-0251— Junos OS: MX Series with MS-PIC, MS-SPC3, MS-MIC or MS-MPC: The BRAS Subscriber Services service activation portal is vulnerable to a Denial of Service (DoS) via malformed HTTP packets

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。 Junos OS 存在代码问题漏洞，目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。

CVSS 8.6 · High EPSS 1.06% · P63
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I. Basic Information for CVE-2021-0251

Vulnerability Information
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Vulnerability Title
Junos OS: MX Series with MS-PIC, MS-SPC3, MS-MIC or MS-MPC: The BRAS Subscriber Services service activation portal is vulnerable to a Denial of Service (DoS) via malformed HTTP packets
Source: CVE Program / CVE List V5
Vulnerability Description
A NULL Pointer Dereference vulnerability in the Captive Portal Content Delivery (CPCD) services daemon (cpcd) of Juniper Networks Junos OS on MX Series with MS-PIC, MS-SPC3, MS-MIC or MS-MPC allows an attacker to send malformed HTTP packets to the device thereby causing a Denial of Service (DoS), crashing the Multiservices PIC Management Daemon (mspmand) process thereby denying users the ability to login, while concurrently impacting other mspmand services and traffic through the device. Continued receipt and processing of these malformed packets will create a sustained Denial of Service (DoS) condition. While the Services PIC is restarting, all PIC services will be bypassed until the Services PIC completes its boot process. An attacker sending these malformed HTTP packets to the device who is not part of the Captive Portal experience is not able to exploit this issue. This issue is not applicable to MX RE-based CPCD platforms. This issue affects: Juniper Networks Junos OS on MX Series 17.3 version 17.3R1 and later versions prior to 17.4 versions 17.4R2-S9, 17.4R3-S2; 18.1 versions prior to 18.1R3-S9; 18.2 versions prior to 18.2R3-S3; 18.3 versions prior to 18.3R3-S1; 18.4 versions prior to 18.4R3; 19.1 versions prior to 19.1R2-S2, 19.1R3; 19.2 versions prior to 19.2R2; 19.3 versions prior to 19.3R3. This issue does not affect: Juniper Networks Junos OS versions prior to 17.3R1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS 代码问题漏洞
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。 Junos OS 存在代码问题漏洞，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 unspecified ~ 17.3R1 -

II. Public POCs for CVE-2021-0251

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III. Intelligence Information for CVE-2021-0251

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Vendor Advisories for CVE-2021-0251 (1)

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-2021-0249 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-2021-0253 7.8 HIGH Junos OS: NFX Series: Local Command Execution Vulnerability in JDMD Leads to Privilege Esc
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-2021-0250 7.5 HIGH Junos OS and Junos OS Evolved: An attacker sending a specific crafted BGP update message w
CVE-2021-0270 7.5 HIGH Junos OS: PTX Series, QFX10K Series: A PTX/QFX FPC may restart unexpectedly with the "inli
CVE-2021-0261 7.5 HIGH Junos OS: Denial of Service vulnerability in J-Web and web based (HTTP/HTTPS) services cau
CVE-2021-0230 7.5 HIGH Junos OS: SRX Series: Memory leak when querying Aggregated Ethernet (AE) interface statist
CVE-2021-0227 7.5 HIGH Junos OS: SRX Series: Denial of Service in J-Web upon receipt of crafted HTTP packets
CVE-2021-0233 7.5 HIGH Junos OS: ACX500 Series, ACX4000 Series: Denial of Service due to FFEB crash while process
CVE-2021-0240 7.4 HIGH Junos OS: Receipt of malformed DHCPv6 packets causes jdhcpd to crash and restart.
CVE-2021-0267 7.4 HIGH Junos OS: Receipt of a crafted DHCP packet will cause the jdhcpd DHCP service to core.
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
Same vendor: Juniper Networks

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