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CVE-2026-33797— Junos OS and Junos OS Evolved: An attacker sending a specific genuine BGP packet causes a BGP reset

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和Juniper Networks 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。Juniper Networks Junos OS Evolved是Junos OS 的升级版系统。 Juniper Networks Junos OS 25.2R2之前版本和Juni

CVSS 7.4 · High EPSS 0.17% · P6
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I. Basic Information for CVE-2026-33797

Vulnerability Information
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Vulnerability Title
Junos OS and Junos OS Evolved: An attacker sending a specific genuine BGP packet causes a BGP reset
Source: CVE Program / CVE List V5
Vulnerability Description
An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker, sending a specific genuine BGP packet in an already established BGP session to reset only that session causing a Denial of Service (DoS). An attacker repeatedly sending the packet will sustain the Denial of Service (DoS).This issue affects Junos OS: * 25.2 versions before 25.2R2 This issue does not affect Junos OS versions before 25.2R1. This issue affects Junos OS Evolved: * 25.2-EVO versions before 25.2R2-EVO This issue does not affect Junos OS Evolved versions before 25.2R1-EVO. eBGP and iBGP are affected. IPv4 and IPv6 are affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS和Juniper Networks Junos OS Evolved 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS和Juniper Networks 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。Juniper Networks Junos OS Evolved是Junos OS 的升级版系统。 Juniper Networks Junos OS 25.2R2之前版本和Juni
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 25.2 ~ 25.2R2 -
Juniper Networks Junos OS Evolved 25.2 ~ 25.2R2-EVO -

II. Public POCs for CVE-2026-33797

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III. Intelligence Information for CVE-2026-33797

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Vendor Advisories for CVE-2026-33797 (1)

Same Patch Batch · Juniper Networks · 2026-04-09 · 26 CVEs total

CVE-2026-33784 9.8 CRITICAL JSI Virtual Lightweight Collector: Default password is not required to be changed which al
CVE-2026-33785 8.8 HIGH Junos OS: MX Series: Missing Authorization for specific 'request' CLI commands in a JDM/CS
CVE-2025-13914 8.7 HIGH Apstra: SSH host key validation vulnerability for managed devices
CVE-2026-33793 7.8 HIGH Junos OS and Junos OS Evolved: When an unsigned Python op script configuration is present,
CVE-2026-33788 7.8 HIGH Junos OS Evolved: Local, authenticated attacker can gain privileged access to FPCs
CVE-2026-33790 7.5 HIGH Junos OS: SRX Series: In a NAT64 configuration, receipt of a specific, malformed ICMPv6 pa
CVE-2026-33778 7.5 HIGH Junos OS: SRX Series, MX Series: When a specifically malformed first ISAKMP packet is rece
CVE-2026-33771 7.4 HIGH CTP OS: Configuring password requirements does not work which permits the use of weak pass
CVE-2026-21916 7.3 HIGH Junos OS: A low privileged user can escalate their privileges so that they can login as ro
CVE-2026-33791 6.7 MEDIUM Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shel
CVE-2026-21915 6.7 MEDIUM JSI Virtual Lightweight Collector: Shell escape allows privilege escalation to root
CVE-2026-33774 6.5 MEDIUM Junos OS: MX Series: Firewall filters on lo0.<non-0> in the default routing instance are n
CVE-2026-33783 6.5 MEDIUM Junos OS Evolved: PTX Series: If SRTE tunnels provisioned via PCEP are present and specifi
CVE-2026-33779 6.5 MEDIUM Junos OS: SRX Series: Insufficient certificate verification for device to SD cloud communi
CVE-2026-33775 6.5 MEDIUM Junos OS: MX Series: Mismatch between configured and received packet types causes memory l
CVE-2026-33782 6.5 MEDIUM Junos OS: MX Series: In specific DHCPv6 scenarios jdhcpd memory increases continuously wit
CVE-2026-33780 6.5 MEDIUM Junos OS and Junos OS Evolved: In an EVPN-MPLS scenario churn of ESI routes causes a memor
CVE-2026-33781 6.5 MEDIUM Junos OS: EX Series, QFX Series: In a VXLAN scenario when specific control protocol packet
CVE-2025-59969 6.5 MEDIUM Junos OS Evolved: QFX5000 Series and PTX Series: An attacker sending crafted multicast pac
CVE-2026-21919 6.5 MEDIUM Junos OS and Junos OS Evolved: A high frequency of connecting and disconnecting NETCONF se

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-20

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