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CVE-2023-36840— Junos OS and Junos OS Evolved: An rpd crash occurs when a specific L2VPN command is run

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 Evolved是美国瞻博网络（Juniper Networks）公司的Junos OS 的升级版系统。 Junos OS和Junos OS Evolved存在安全漏洞，该漏洞源于路由协议守护程序(RPD)存在可到达断言漏洞，攻击者可利用该漏洞造成拒绝服务（DoS）。受影响的产品和版本：Juniper Networks Junos OS： 19.3R3-S7之前的所有版本；19.4R3-S10之前的19.4版本；20.1R3-S4之前的20.1版本；20.

CVSS 5.5 · Medium EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-36840

Vulnerability Information
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Vulnerability Title
Junos OS and Junos OS Evolved: An rpd crash occurs when a specific L2VPN command is run
Source: CVE Program / CVE List V5
Vulnerability Description
A Reachable Assertion vulnerability in Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows a locally-based, low-privileged attacker to cause a Denial of Service (DoS). On all Junos OS and Junos OS Evolved, when a specific L2VPN command is run, RPD will crash and restart. Continued execution of this specific command will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS All versions prior to 19.3R3-S10; 20.1 versions prior to 20.1R3-S4; 20.2 versions prior to 20.2R3-S6; 20.3 versions prior to 20.3R3-S6; 20.4 versions prior to 20.4R3-S5; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3-S3; 21.3 versions prior to 21.3R3-S2; 21.4 versions prior to 21.4R3; 22.1 versions prior to 22.1R3; 22.2 versions prior to 22.2R2; 22.3 versions prior to 22.3R2; Juniper Networks Junos OS Evolved All versions prior to 20.4R3-S7-EVO; 21.1 versions prior to 21.1R3-S3-EVO; 21.2 versions prior to 21.2R3-S5-EVO; 21.3 versions prior to 21.3R3-S4-EVO; 21.4 versions prior to 21.4R3-EVO; 22.1 versions prior to 22.1R3-EVO; 22.2 versions prior to 22.2R2-EVO; 22.3 versions prior to 22.3R2-EVO;
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS Evolved安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS Evolved是美国瞻博网络（Juniper Networks）公司的Junos OS 的升级版系统。 Junos OS和Junos OS Evolved存在安全漏洞，该漏洞源于路由协议守护程序(RPD)存在可到达断言漏洞，攻击者可利用该漏洞造成拒绝服务（DoS）。受影响的产品和版本：Juniper Networks Junos OS： 19.3R3-S7之前的所有版本；19.4R3-S10之前的19.4版本；20.1R3-S4之前的20.1版本；20.
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 ~ 19.3R3-S10 -
Juniper Networks Junos OS Evolved unspecified ~ 20.4R3-S7-EVO -

II. Public POCs for CVE-2023-36840

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III. Intelligence Information for CVE-2023-36840

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Other References for CVE-2023-36840 (1)

Same Patch Batch · Juniper Networks · 2023-07-14 · 12 CVEs total

CVE-2023-36835 7.5 HIGH Junos OS: QFX10000 Series: All traffic will be dropped after a specific valid IP packet ha
CVE-2023-28985 7.5 HIGH SRX Series and MX Series: An FPC core is observed when IDP is enabled on the device and a
CVE-2023-36832 7.5 HIGH Junos OS: MX Series: PFE crash upon receipt of specific packet destined to an AMS interfac
CVE-2023-36831 7.5 HIGH Junos OS: SRX Series: jbuf memory leak when SSL Proxy and UTM Web-Filtering is applied
CVE-2023-36850 6.5 MEDIUM Junos OS: MX Series: An MPC will crash upon receipt of a malformed CFM packet.
CVE-2023-36849 6.5 MEDIUM Junos OS and Junos OS Evolved: The l2cpd will crash when a malformed LLDP packet is receiv
CVE-2023-36848 6.5 MEDIUM Junos OS: MX Series: The FPC will crash on receiving a malformed CFM packet
CVE-2023-36834 6.5 MEDIUM Junos OS: SRX 4600 and SRX 5000 Series: The receipt of specific genuine packets by SRXes c
CVE-2023-36833 6.5 MEDIUM Junos OS Evolved: PTX10001-36MR, and PTX10004, PTX10008, PTX10016 with LC1201/1202: The af
CVE-2023-36838 5.5 MEDIUM Junos OS: SRX Series: A flowd core occurs when running a low privileged CLI command
CVE-2023-36836 4.7 MEDIUM Junos OS and Junos OS Evolved: In a MoFRR scenario an rpd core may be observed when a low

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-617

V. Comments for CVE-2023-36840

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