CVE-2025-52947

MEDIUM
Published Jul 11, 2025 Modified Jan 23, 2026 CWE-755

Description

An Improper Handling of Exceptional Conditions vulnerability in route processing of Juniper Networks Junos OS on specific end-of-life (EOL) ACX Series platforms allows an attacker to crash the Forwarding Engine Board (FEB) by flapping an interface, leading to a Denial of Service (DoS). On ACX1000, ACX1100, ACX2000, ACX2100, ACX2200, ACX4000, ACX5048, and ACX5096 devices, FEB0 will crash when the primary path port of the L2 circuit IGP (Interior Gateway Protocol) on the local device goes down. This issue is seen only when 'hot-standby' mode is configured for the L2 circuit. This issue affects Junos OS on ACX1000, ACX1100, ACX2000, ACX2100, ACX2200, ACX4000, ACX5048, and ACX5096:  * all versions before 21.2R3-S9.

Is your site exposed to CVE-2025-52947?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

6.5
MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-755 CWE-755

Affected Products

Vendor Product
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper junos
juniper acx1000
juniper acx1100
juniper acx2000
juniper acx2100
juniper acx2200
juniper acx4000
juniper acx5048
juniper acx5096

References

Frequently Asked Questions

What is CVE-2025-52947? +
An Improper Handling of Exceptional Conditions vulnerability in route processing of Juniper Networks Junos OS on specific end-of-life (EOL) ACX Series platforms allows an attacker to crash the Forwarding Engine Board (FEB) by flapping an interface, leading to a Denial of Service (DoS). On ACX1000, ACX1100, ACX2000, ACX2100, ACX2200, ACX4000, ACX5048, and ACX5096 devices, FEB0 will crash when the primary path port of the L2 circuit IGP (Interior Gateway Protocol) on the local device goes down. This issue is seen only when 'hot-standby' mode is configured for the L2 circuit. This issue affects Junos OS on ACX1000, ACX1100, ACX2000, ACX2100, ACX2200, ACX4000, ACX5048, and ACX5096:  * all versions before 21.2R3-S9. It has a CVSS v3.1 base score of 6.5 (MEDIUM).
How severe is CVE-2025-52947? +
CVE-2025-52947 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2025-52947? +
CVE-2025-52947 affects products from juniper, specifically: acx1000, acx1100, acx2000, acx2100, acx2200, acx4000, acx5048, acx5096, junos. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2025-52947? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-24478

A denial-of-service vulnerability exists in the affected products. The vulnerability could allow a remote, non-privileged user to send malicious requests …
CVE-2024-47609

Tonic is a native gRPC client & server implementation with async/await support. When using tonic::transport::Server there is a remote DoS …
CVE-2025-9437

A security issue exists within the Studio 5000 Logix Designer add-on profile (AOP) for the ArmorStart Classic distributed motor controller, …
CVE-2024-51502

loona is an experimental, HTTP/1.1 and HTTP/2 implementation in Rust on top of io-uring. `loona-hpack` suffers from the same vulnerability …
CVE-2024-41886

Team ENVY, a Security Research TEAM has found a flaw that allows for a remote code execution on the NVR. …
CVE-2026-49232

Routinator exits on any error when accepting incoming HTTP or RTR connections, including ones it can recover from such as …

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2025-52947 — free, no signup required.