VulnSocial

CVE-2025-21590General(juniper / junos)

LOWCVSS 6.7 · MEDIUMCISA KEV

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

An Improper Isolation or Compartmentalization vulnerability in the kernel of Juniper Networks Junos OS allows a local attacker with high privileges to compromise the integrity of the device. A local attacker with access to the shell is able to inject arbitrary code which can compromise an affected device. This issue is not exploitable from the Junos CLI. This issue affects Junos OS:  * All versions before 21.2R3-S9, * 21.4 versions before 21.4R3-S10,  * 22.2 versions before 22.2R3-S6,  * 22.4 versions before 22.4R3-S6,  * 23.2 versions before 23.2R2-S3,  * 23.4 versions before 23.4R2-S4, * 24.2 versions before 24.2R1-S2, 24.2R2.

juniper CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Listed in the CISA Known Exploited Vulnerabilities catalog. Federal remediation due date: 2025-04-03. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-653

Priority

LOW

Exploitation

ACTIVE

PoC

NONE

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • junos

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • General: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-04-12); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
juniper
Products
junos

7 versions affected across 1 product

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-04-12: 1Mentions · 2026-05-14: 104-1205-14
Signal classification1 categories
General
2100.0%
Referenced assets2 URLs
Full discourse2 posts
  • Picus Security@PicusSecurity
    General

    @attritionorg There was a typo in the blog. Sorry about that. The correct CVE is CVE-2025-21590. Source: Mandiant >> https://www.google.com/search?client=safari&rls=en&q=UNC3886+Mandiant+CVE-2025-21590.&ie=UTF-8&oe=UTF-8

    Post summary

    A brief tweet corrects the CVE identifier in a previous blog post, linking only to a search engine query; no further technical, exploit, or mitigation details are provided.

    100101.3K
    2.9K followersView on X
  • 保護種@r9mata
    General

    消去法で Juniper かな🤔 と思って念の為 CVE 検索したら 出てやがった CVE Record: CVE-2025-21590 https://share.google/vmdvCU9IXpqpHX5xY

    Post summary

    The user simply discovered a CVE record for Juniper (CVE-2025-21590) with no further details on exploitation, patching, or technical specifics.

    00001872
    1.1K followersView on X
CPE platform detail79 entries

79 of 79 entries

PartVendorProductVersionTarget SWTarget HW
OSjuniperjunos---
OSjuniperjunos21.2--
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