CVE-2021-0260

Junos OS: SNMP fails to properly perform authorization checks on incoming received SNMP requests.

Description

An improper authorization vulnerability in the Simple Network Management Protocol daemon (snmpd) service of Juniper Networks Junos OS leads an unauthenticated attacker being able to perform SNMP read actions, an Exposure of System Data to an Unauthorized Control Sphere, or write actions to OIDs that support write operations, against the device without authentication. This issue affects: Juniper Networks Junos OS: 17.2 version 17.2R1 and later versions; 17.3 versions prior to 17.3R3-S9; 17.4 versions prior to 17.4R2-S12, 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R2-S5, 18.4R3; 19.1 versions prior to 19.1R2; 19.2 versions prior to 19.2R1-S6, 19.2R2; 19.3 versions prior to 19.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 17.2R1.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue: 17.3R3-S9, 17.4R2-S12, 17.4R3-S5, 18.1R3-S13, 18.2R3-S8, 18.3R3-S5, 18.4R1-S8, 18.4R2-S5, 18.4R3, 19.1R2, 19.2R1-S6, 19.2R2, 19.3R2, 19.4R1, and all subsequent releases.

Workaround:

  • The following workaround command will disable SNMP support for the mgmt_junos routing interface and protect the device from being exploited: # set snmp disable-mgmt-junos-support

Category

7.3
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.88% Top 30%
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Published at:
Updated at:

References

Link Tags
https://kb.juniper.net/JSA11151 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-0260?
CVE-2021-0260 has been scored as a high severity vulnerability.
How to fix CVE-2021-0260?
To fix CVE-2021-0260: The following software releases have been updated to resolve this specific issue: 17.3R3-S9, 17.4R2-S12, 17.4R3-S5, 18.1R3-S13, 18.2R3-S8, 18.3R3-S5, 18.4R1-S8, 18.4R2-S5, 18.4R3, 19.1R2, 19.2R1-S6, 19.2R2, 19.3R2, 19.4R1, and all subsequent releases.
Is CVE-2021-0260 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-0260 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-0260?
CVE-2021-0260 affects Juniper Networks Junos OS.
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