CVE-2025-52955
Junos OS and Junos OS Evolved: When jflow/sflow is configured continuous logical interface flaps causes rpd crash and restart
An Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause a memory corruption that leads to a rpd crash.
When the logical interface using a routing instance flaps continuously, specific updates are sent to the jflow/sflow modules. This results in memory corruption, leading to an rpd crash and restart.
Continued receipt of these specific updates will cause a sustained Denial of Service condition.
This issue affects Junos OS:
- All versions before 21.2R3-S9,
- All versions of 21.4,
- All versions of 22.2,
- from 22.4 before 22.4R3-S7,
- from 23.2 before 23.2R2-S3,
- from 23.4 before 23.4R2-S4,
- from 24.2 before 24.2R2.
Junos OS Evolved:
- All versions of 21.2-EVO,
- All versions of 21.4-EVO,
- All versions of 22.2-EVO,
- from 22.4 before 22.4R3-S7-EVO,
- from 23.2 before 23.2R2-S3-EVO,
- from 23.4 before 23.4R2-S4-EVO,
- from 24.2 before 24.2R2-EVO.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Junos OS and Junos OS Evolved: When jflow/sflow is configured continuous logical interface flaps causes rpd crash and restart
An Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause a memory corruption that leads to a rpd crash.
When the logical interface using a routing instance flaps continuously, specific updates are sent to the jflow/sflow modules. This results in memory corruption, leading to an rpd crash and restart.
Continued receipt of these specific updates will cause a sustained Denial of Service condition.
This issue affects Junos OS:
- All versions before 21.2R3-S9,
- All versions of 21.4,
- All versions of 22.2,
- from 22.4 before 22.4R3-S7,
- from 23.2 before 23.2R2-S3,
- from 23.4 before 23.4R2-S4,
- from 24.2 before 24.2R2.
Junos OS Evolved:
- All versions of 21.2-EVO,
- All versions of 21.4-EVO,
- All versions of 22.2-EVO,
- from 22.4 before 22.4R3-S7-EVO,
- from 23.2 before 23.2R2-S3-EVO,
- from 23.4 before 23.4R2-S4-EVO,
- from 24.2 before 24.2R2-EVO.
- Record
CVE-2025-52955- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/R:A/U:Green - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-131
- Updated
- 2026-11-02
EUVDEUVD-2025-21163
An Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause a memory corruption that leads to a rpd crash.
When the logical interface using a routing instance flaps continuously, specific updates are sent to the jflow/sflow modules. This results in memory corruption, leading to an rpd crash and restart.
Continued receipt of these specific updates will cause a sustained Denial of Service condition.
This issue affects Junos OS:
- All versions before 21.2R3-S9,
- All versions of 21.4,
- All versions of 22.2,
- from 22.4 before 22.4R3-S7,
- from 23.2 before 23.2R2-S3,
- from 23.4 before 23.4R2-S4,
- from 24.2 before 24.2R2.
Junos OS Evolved:
- All versions of 21.2-EVO,
- All versions of 21.4-EVO,
- All versions of 22.2-EVO,
- from 22.4 before 22.4R3-S7-EVO,
- from 23.2 before 23.2R2-S3-EVO,
- from 23.4 before 23.4R2-S4-EVO,
- from 24.2 before 24.2R2-EVO.
- Record
EUVD-2025-21163- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/R:A/U:Green - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-8g52-rhvw-9278
An Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of...
An Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS allows an adjacent unauthenticated attacker to cause a memory corruption that leads to a rpd crash.
When the logical interface using a routing instance flaps continuously, specific updates are sent to the jflow/sflow modules. This results in memory corruption, leading to an rpd crash and restart.
Continued receipt of these specific updates will cause a sustained Denial of Service condition.
This issue affects Junos OS:
- All versions before 21.2R3-S9,
- All versions of 21.4,
- All versions of 22.2,
- from 22.4 before 22.4R3-S7,
- from 23.2 before 23.2R2-S3,
- from 23.4 before 23.4R2-S4,
- from 24.2 before 24.2R2.
- Record
GHSA-8g52-rhvw-9278- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-131
- Updated
- 2026-11-02
NVD
An Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause a memory corruption that leads to a rpd crash.
When the logical interface using a routing instance flaps continuously, specific updates are sent to the jflow/sflow modules. This results in memory corruption, leading to an rpd crash and restart.
Continued receipt of these specific updates will cause a sustained Denial of Service condition.
This issue affects Junos OS:
- All versions before 21.2R3-S9,
- All versions of 21.4,
- All versions of 22.2,
- from 22.4 before 22.4R3-S7,
- from 23.2 before 23.2R2-S3,
- from 23.4 before 23.4R2-S4,
- from 24.2 before 24.2R2.
Junos OS Evolved:
- All versions of 21.2-EVO,
- All versions of 21.4-EVO,
- All versions of 22.2-EVO,
- from 22.4 before 22.4R3-S7-EVO,
- from 23.2 before 23.2R2-S3-EVO,
- from 23.4 before 23.4R2-S4-EVO,
- from 24.2 before 24.2R2-EVO.
- Record
CVE-2025-52955- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:A/V:X/RE:X/U:Green - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-131
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-52955 is a high vulnerability (CVSS 7.1) in Juniper Junos, published July 11, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 24th percentile. No source names a fixed version.