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2021-04 Security Bulletin: Junos OS: QFX10002-60C: Use after free vulnerability found during static code analysis (CVE-2021-0262)



Article ID: JSA11153 SECURITY_ADVISORIES Last Updated: 14 Apr 2021Version: 1.0
Product Affected:
This issue affects Junos OS 19.1, 19.2, 20.2. Affected platforms: QFX10002-60C.

Through routine static code analysis of the Juniper Networks Junos OS software codebase, the Secure Development Life Cycle team identified a Use After Free vulnerability in PFE packet processing on the QFX10002-60C switching platform. Exploitation of this vulnerability may allow a logically adjacent attacker to trigger a Denial of Service (DoS). Continued exploitation of this vulnerability will sustain the Denial of Service (DoS) condition.

This issue only affects QFX10002-60C devices. No other product or platform is vulnerable to this issue.

This issue affects Juniper Networks Junos OS on QFX10002-60C:

  • 19.1 version 19.1R3-S1 and later versions;
  • 19.1 versions prior to 19.1R3-S3;
  • 19.2 version 19.2R2 and later versions;
  • 19.2 versions prior to 19.2R3-S1;
  • 20.2 versions prior to 20.2R1-S2.

This issue does not affect Juniper Networks Junos OS:

  • versions prior to 19.1R3;
  • 19.2 versions prior to 19.2R2;
  • any version of 19.3;
  • version 20.2R2 and later releases.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was found during internal product security testing.

This issue has been assigned CVE-2021-0262.


The following software releases have been updated to resolve this specific issue: Junos OS 19.1R3-S3, 19.2R3-S1, 20.2R1-S2, and all subsequent releases.

This issue is being tracked as 1519453.

There are no viable workarounds for this issue.
Software releases or updates are available for download at
Modification History:
2021-04-14: Initial Publication.

CVSS Score:
6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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