CVE-2026-57025 (GCVE-0-2026-57025)

Vulnerability from cvelistv5 – Published: 2026-07-09 21:07 – Updated: 2026-07-09 21:07
VLAI
Title
Junos OS and Junos OS Evolved: EX Series, QFX Series, MX Series: A specific 'show l2-learning' command causes l2ald crash
Summary
A Return of Pointer Value Outside of Expected Range vulnerability in the fileio library of Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privilged attacker to cause a Denial-of-Service (DoS). On EX Series, QFX Series and MX Series a low-privileged attacker issuing a specific 'show l2-learning' command will cause an l2ald crash which will lead to a temporary service impact for all layer 2 services until the process has automatically restarted. This issue affects EX Series, QFX Series, MX Series: Junos OS: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S7, * 24.2 versions before 24.2R2, * 24.4 versions before 24.4R1-S2. Junos OS Evolved: * all versions before 23.2R2-S7-EVO, * 23.4 versions before 23.4R2-S8-EVO, * 24.2 versions before 24.2R2-EVO, * 24.4 versions before 24.4R1-S3-EVO.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M
CWE
  • CWE-466 - Return of Pointer Value Outside of Expected Range
Assigner
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Affected: 0 , < 23.2R2-S7 (custom)
Affected: 23.4 , < 23.4R2-S7 (custom)
Affected: 24.2 , < 24.2R2 (custom)
Affected: 24.4 , < 24.4R1-S2 (custom)
Create a notification for this product.
Juniper Networks Junos OS Evolved Affected: 0 , < 23.2R2-S7-EVO (custom)
Affected: 23.4 , < 23.4R2-S8-EVO (custom)
Affected: 24.2 , < 24.2R2-EVO (custom)
Affected: 24.4 , < 24.4R1-S3-EVO (custom)
Create a notification for this product.
Date Public
2026-07-08 16:00
Show details on NVD website
To clipboard 

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              "value": "A Return of Pointer Value Outside of Expected Range vulnerability in the fileio library of Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privilged attacker to cause a Denial-of-Service (DoS).\u003cbr\u003e\u003cbr\u003eOn EX Series, QFX Series and MX Series a\u0026nbsp;low-privileged attacker issuing a specific \u0027show l2-learning\u0027 command will cause an l2ald crash which will lead to a temporary service impact for all layer 2 services until the process has automatically restarted.\u003cbr\u003e\u003cp\u003e\u003cbr\u003eThis issue affects EX Series, QFX Series, MX Series:\u003cbr\u003eJunos OS:\u003cbr\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eall versions before 23.2R2-S7,\u003c/li\u003e\u003cli\u003e23.4 versions before 23.4R2-S7,\u003c/li\u003e\u003cli\u003e24.2 versions before 24.2R2,\u003c/li\u003e\u003cli\u003e24.4 versions before 24.4R1-S2.\u003c/li\u003e\u003c/ul\u003e\u003cbr\u003eJunos OS Evolved:\u003cbr\u003e\u003cul\u003e\u003cli\u003eall versions before 23.2R2-S7-EVO,\u003c/li\u003e\u003cli\u003e23.4 versions before 23.4R2-S8-EVO,\u003c/li\u003e\u003cli\u003e24.2 versions before 24.2R2-EVO,\u003c/li\u003e\u003cli\u003e24.4 versions before 24.4R1-S3-EVO.\u003c/li\u003e\u003c/ul\u003e\u003cbr\u003e\u003cp\u003e\u003c/p\u003e"
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          "value": "A Return of Pointer Value Outside of Expected Range vulnerability in the fileio library of Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privilged attacker to cause a Denial-of-Service (DoS).\n\nOn EX Series, QFX Series and MX Series a\u00a0low-privileged attacker issuing a specific \u0027show l2-learning\u0027 command will cause an l2ald crash which will lead to a temporary service impact for all layer 2 services until the process has automatically restarted.\n\nThis issue affects EX Series, QFX Series, MX Series:\nJunos OS:\n\n\n  *  all versions before 23.2R2-S7,\n  *  23.4 versions before 23.4R2-S7,\n  *  24.2 versions before 24.2R2,\n  *  24.4 versions before 24.4R1-S2.\n\n\n\nJunos OS Evolved:\n  *  all versions before 23.2R2-S7-EVO,\n  *  23.4 versions before 23.4R2-S8-EVO,\n  *  24.2 versions before 24.2R2-EVO,\n  *  24.4 versions before 24.4R1-S3-EVO."
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    "dateReserved": "2026-06-23T16:27:00.248Z",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.