CVE Feed

    Dashboard / CVE / CVE-2021-31374

    CVE-2021-31374

    On Juniper Networks Junos OS and Junos OS Evolved devices processing a specially crafted BGP UPDATE or KEEPALIVE message can lead to a routing process daemon (RPD) crash and restart, causing a Denial of Service (DoS). Continued receipt and processing of this message will create a sustained Denial of Service (DoS) condition. This issue affects both IBGP and EBGP deployments over IPv4 or IPv6. This issue affects: Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13, 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S7; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S1; 19.3 versions prior to 19.3R2-S5, 19.3R3-S1; 19.4 versions prior to 19.4R1-S4, 19.4R1-S4, 19.4R2-S3, 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R1-S1, 20.3R2. Juniper Networks Junos OS Evolved: 20.3 versions prior to 20.3R2-EVO.

    Published:Oct 19, 2021
    Last Modified:Nov 21, 2024
    EPS:Oct 19, 2021
    EPSS Score:0.00389
    CVSS Score:7.5

    Affected Products

    Vendor
    Juniper
    Product
    Junos
    Vendor
    Juniper
    Product
    Junos Os Evolved

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-57031 (CVSS 5.3) — An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of…
    CVE-2026-33800 (CVSS 7.1) — An Unchecked Input for Loop Condition vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks …
    CVE-2026-21901 (CVSS 6.7) — A NULL Pointer Dereference vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos…
    CVE-2026-33791 (CVSS 8.4) — An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and Junos OS Evolved …
    CVE-2026-33790 (CVSS 8.7) — An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Ne…
    CVE-2026-33787 (CVSS 6.8) — An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis control daemon (chassisd)…
    CVE-2026-33785 (CVSS 6.3) — A Missing Authorization vulnerability in the CLI of Juniper Networks Junos OS on MX Series allows a local, aut…
    CVE-2026-33781 (CVSS 7.1) — An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (pfe) of…
    CVE-2026-33778 (CVSS 8.7) — An Improper Validation of Syntactic Correctness of Input vulnerability in the IPsec library used by kmd and i…
    CVE-2026-33776 (CVSS 6.8) — A Missing Authorization vulnerability in the CLI of Juniper Networks Junos OS and Junos OS Evolved allows a lo…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High