CVE-2025-52949
Junos OS and Junos OS Evolved: In an EVPN environment, receipt of specifically malformed BGP update causes RPD crash
An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent BGP peer sending a specifically malformed BGP packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.
Only systems configured for Ethernet Virtual Private Networking (EVPN) signaling are vulnerable to this issue.
This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.This issue affects:
Junos OS:
- all versions before 21.4R3-S11,
- from 22.2 before 22.2R3-S7,
- from 22.4 before 22.4R3-S7,
- from 23.2 before 23.2R2-S4,
- from 23.4 before 23.4R2-S5,
- from 24.2 before 24.2R2-S1,
- from 24.4 before 24.4R1-S3, 24.4R2;
Junos OS Evolved:
- all versions before 22.2R3-S7-EVO,
- from 22.4-EVO before 22.4R3-S7-EVO,
- from 23.2-EVO before 23.2R2-S4-EVO,
- from 23.4-EVO before 23.4R2-S5-EVO,
- from 24.2-EVO before 24.2R2-S1-EVO,
- from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-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: In an EVPN environment, receipt of specifically malformed BGP update causes RPD crash
An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent BGP peer sending a specifically malformed BGP packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.
Only systems configured for Ethernet Virtual Private Networking (EVPN) signaling are vulnerable to this issue.
This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.This issue affects:
Junos OS:
- all versions before 21.4R3-S11,
- from 22.2 before 22.2R3-S7,
- from 22.4 before 22.4R3-S7,
- from 23.2 before 23.2R2-S4,
- from 23.4 before 23.4R2-S5,
- from 24.2 before 24.2R2-S1,
- from 24.4 before 24.4R1-S3, 24.4R2;
Junos OS Evolved:
- all versions before 22.2R3-S7-EVO,
- from 22.4-EVO before 22.4R3-S7-EVO,
- from 23.2-EVO before 23.2R2-S4-EVO,
- from 23.4-EVO before 23.4R2-S5-EVO,
- from 24.2-EVO before 24.2R2-S1-EVO,
- from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.
- Record
CVE-2025-52949- 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/AU:Y/R:A/V:C/RE:M/U:Amber - 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-130
- Updated
- 2026-11-02
EUVDEUVD-2025-21155
An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent BGP peer sending a specifically malformed BGP packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.
Only systems configured for Ethernet Virtual Private Networking (EVPN) signaling are vulnerable to this issue.
This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.This issue affects:
Junos OS:
- all versions before 21.4R3-S11,
- from 22.2 before 22.2R3-S7,
- from 22.4 before 22.4R3-S7,
- from 23.2 before 23.2R2-S4,
- from 23.4 before 23.4R2-S5,
- from 24.2 before 24.2R2-S1,
- from 24.4 before 24.4R1-S3, 24.4R2;
Junos OS Evolved:
- all versions before 22.2R3-S7-EVO,
- from 22.4-EVO before 22.4R3-S7-EVO,
- from 23.2-EVO before 23.2R2-S4-EVO,
- from 23.4-EVO before 23.4R2-S5-EVO,
- from 24.2-EVO before 24.2R2-S1-EVO,
- from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.
- Record
EUVD-2025-21155- 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/AU:Y/R:A/V:C/RE:M/U:Amber - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-fx8c-8vrh-7hg5
An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol...
An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent BGP peer sending a specifically malformed BGP packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.
Only systems configured for Ethernet Virtual Private Networking (EVPN) signaling are vulnerable to this issue.
This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.This issue affects:
Junos OS:
- all versions before 21.4R3-S11,
- from 22.2 before 22.2R3-S7,
- from 22.4 before 22.4R3-S7,
- from 23.2 before 23.2R2-S4,
- from 23.4 before 23.4R2-S5,
- from 24.2 before 24.2R2-S1,
- from 24.4 before 24.4R1-S3, 24.4R2;
Junos OS Evolved:
- all versions before 22.2R3-S7-EVO,
- from 22.4-EVO before 22.4R3-S7-EVO,
- from 23.2-EVO before 23.2R2-S4-EVO,
- from 23.4-EVO before 23.4R2-S5-EVO,
- from 24.2-EVO before 24.2R2-S1-EVO,
- from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.
- Record
GHSA-fx8c-8vrh-7hg5- 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:Y/R:A/V:C/RE:M/U:Amber - 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-130
- Updated
- 2026-11-02
NVD
An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent BGP peer sending a specifically malformed BGP packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.
Only systems configured for Ethernet Virtual Private Networking (EVPN) signaling are vulnerable to this issue.
This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.This issue affects:
Junos OS:
- all versions before 21.4R3-S11,
- from 22.2 before 22.2R3-S7,
- from 22.4 before 22.4R3-S7,
- from 23.2 before 23.2R2-S4,
- from 23.4 before 23.4R2-S5,
- from 24.2 before 24.2R2-S1,
- from 24.4 before 24.4R1-S3, 24.4R2;
Junos OS Evolved:
- all versions before 22.2R3-S7-EVO,
- from 22.4-EVO before 22.4R3-S7-EVO,
- from 23.2-EVO before 23.2R2-S4-EVO,
- from 23.4-EVO before 23.4R2-S5-EVO,
- from 24.2-EVO before 24.2R2-S1-EVO,
- from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.
- Record
CVE-2025-52949- 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:Y/R:A/V:C/RE:M/U:Amber - 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-130
- 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-2025-52949 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.