Vulnerability Name:

CVE-2021-0294 (CCN-205442)

Assigned:2020-10-27
Published:2021-07-14
Updated:2021-07-28
Summary:A vulnerability in Juniper Networks Junos OS, which only affects the release 18.4R2-S5, where a function is inconsistently implemented on Juniper Networks Junos QFX5000 Series and EX4600 Series, and if "storm-control enhanced" is configured, can lead to the enhanced storm control filter group not be installed. It will cause storm control not to work hence allowing an attacker to cause high CPU usage or packet loss issues by sending a large amount of broadcast or unknown unicast packets arriving the device. This issue affects Juniper Networks QFX5100, QFX5110, QFX5120, QFX5200, QFX5210, EX4600, and EX4650, and QFX5100 with QFX 5e Series image installed. QFX5130 and QFX5220 are not affected from this issue. This issue affects Juniper Networks Junos OS 18.4R2-S5 on QFX5000 Series and EX4600 Series. No other product or platform is affected by this vulnerability.
CVSS v3 Severity:5.3 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.6 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-Other
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-0294

Source: XF
Type: UNKNOWN
juniper-cve20210294-dos(205442)

Source: CCN
Type: Juniper Networks Security Bulletin JSA11196
Junos OS: QFX5000 Series and EX4600 Series: Enhanced storm control might not work leading to partial Denial of Service (CVE-2021-0294)

Source: CONFIRM
Type: Vendor Advisory
https://kb.juniper.net/JSA11196

Vulnerable Configuration:Configuration 1:
  • cpe:/o:juniper:junos:18.4:r2-s5:*:*:*:*:*:*
  • AND
  • cpe:/h:juniper:ex4600:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:ex4650:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:qfx5100:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:qfx5110:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:qfx5120:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:qfx5200:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:qfx5210:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:juniper:junos:18.4:r2-s5:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    juniper junos 18.4 r2-s5
    juniper ex4600 -
    juniper ex4650 -
    juniper qfx5100 -
    juniper qfx5110 -
    juniper qfx5120 -
    juniper qfx5200 -
    juniper qfx5210 -
    juniper junos 18.4 r2-s5