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.
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://supportportal.juniper.net/JSA100051 |
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History
Fri, 23 Jan 2026 19:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Juniper
Juniper acx1000 Juniper acx1100 Juniper acx2000 Juniper acx2100 Juniper acx2200 Juniper acx4000 Juniper acx5048 Juniper acx5096 Juniper junos |
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| CPEs | cpe:2.3:h:juniper:acx1000:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:acx1100:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:acx2000:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:acx2100:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:acx2200:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:acx4000:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:acx5048:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:acx5096:-:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r1-s1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r1-s2:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r2-s1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r2-s2:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r2:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r3-s1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r3-s2:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r3-s3:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r3-s4:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r3-s5:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r3-s6:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r3-s7:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r3-s8:*:*:*:*:*:* cpe:2.3:o:juniper:junos:21.2:r3:*:*:*:*:*:* |
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| Vendors & Products |
Juniper
Juniper acx1000 Juniper acx1100 Juniper acx2000 Juniper acx2100 Juniper acx2200 Juniper acx4000 Juniper acx5048 Juniper acx5096 Juniper junos |
Sat, 12 Jul 2025 13:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
epss
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Fri, 11 Jul 2025 16:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Fri, 11 Jul 2025 15:00:00 +0000
| Type | Values Removed | Values Added |
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| 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. | |
| Title | Junos OS: ACX Series: When 'hot-standby' mode is configured for an L2 circuit, interface flap causes the FEB to crash | |
| Weaknesses | CWE-755 | |
| References |
| |
| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: juniper
Published: 2025-07-11T14:40:14.792Z
Updated: 2025-07-11T15:25:08.865Z
Reserved: 2025-06-23T13:16:01.408Z
Link: CVE-2025-52947
Updated: 2025-07-11T15:25:06.197Z
Status : Analyzed
Published: 2025-07-11T15:15:25.000
Modified: 2026-01-23T19:36:17.357
Link: CVE-2025-52947
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