CVE-2024-21598
Junos OS and Junos OS Evolved: A malformed BGP tunnel encapsulation attribute will lead to an rpd crash
An Improper Validation of Syntactic Correctness of Input vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).
If a BGP update is received over an established BGP session which contains a tunnel encapsulation attribute with a specifically malformed TLV, rpd will crash and restart.
This issue affects Juniper Networks Junos OS:
- 20.4 versions 20.4R1 and later versions earlier than 20.4R3-S9;
- 21.2 versions earlier than 21.2R3-S7;
- 21.3 versions earlier than 21.3R3-S5;
- 21.4 versions earlier than 21.4R3-S5;
- 22.1 versions earlier than 22.1R3-S4;
- 22.2 versions earlier than 22.2R3-S3;
- 22.3 versions earlier than 22.3R3-S1;
- 22.4 versions earlier than 22.4R3;
- 23.2 versions earlier than 23.2R1-S2, 23.2R2;
Junos OS Evolved:
- 20.4-EVO versions 20.4R1-EVO and later versions earlier than 20.4R3-S9-EVO;
- 21.2-EVO versions earlier than 21.2R3-S7-EVO;
- 21.3-EVO versions earlier than 21.3R3-S5-EVO;
- 21.4-EVO versions earlier than 21.4R3-S5-EVO;
- 22.1-EVO versions earlier than 22.1R3-S4-EVO;
- 22.2-EVO versions earlier than 22.2R3-S3-EVO;
- 22.3-EVO versions earlier than 22.3R3-S1-EVO;
- 22.4-EVO versions earlier than 22.4R3-EVO;
- 23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO;
This issue does not affect Juniper Networks
- Junos OS versions earlier than 20.4R1;
- Junos OS Evolved versions earlier than 20.4R1-EVO.
This is a related but separate issue than the one described in JSA79095.
Attack profile
How easy it is to exploit
- Attack vector
- 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: A malformed BGP tunnel encapsulation attribute will lead to an rpd crash
An Improper Validation of Syntactic Correctness of Input vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).
If a BGP update is received over an established BGP session which contains a tunnel encapsulation attribute with a specifically malformed TLV, rpd will crash and restart.
This issue affects Juniper Networks Junos OS:
- 20.4 versions 20.4R1 and later versions earlier than 20.4R3-S9;
- 21.2 versions earlier than 21.2R3-S7;
- 21.3 versions earlier than 21.3R3-S5;
- 21.4 versions earlier than 21.4R3-S5;
- 22.1 versions earlier than 22.1R3-S4;
- 22.2 versions earlier than 22.2R3-S3;
- 22.3 versions earlier than 22.3R3-S1;
- 22.4 versions earlier than 22.4R3;
- 23.2 versions earlier than 23.2R1-S2, 23.2R2;
Junos OS Evolved:
- 20.4-EVO versions 20.4R1-EVO and later versions earlier than 20.4R3-S9-EVO;
- 21.2-EVO versions earlier than 21.2R3-S7-EVO;
- 21.3-EVO versions earlier than 21.3R3-S5-EVO;
- 21.4-EVO versions earlier than 21.4R3-S5-EVO;
- 22.1-EVO versions earlier than 22.1R3-S4-EVO;
- 22.2-EVO versions earlier than 22.2R3-S3-EVO;
- 22.3-EVO versions earlier than 22.3R3-S1-EVO;
- 22.4-EVO versions earlier than 22.4R3-EVO;
- 23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO;
This issue does not affect Juniper Networks
- Junos OS versions earlier than 20.4R1;
- Junos OS Evolved versions earlier than 20.4R1-EVO.
This is a related but separate issue than the one described in JSA79095.
- Record
CVE-2024-21598- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-1286
- Updated
- 2026-11-02
EUVDEUVD-2024-19246
An Improper Validation of Syntactic Correctness of Input vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).
If a BGP update is received over an established BGP session which contains a tunnel encapsulation attribute with a specifically malformed TLV, rpd will crash and restart.
This issue affects Juniper Networks Junos OS:
- 20.4 versions 20.4R1 and later versions earlier than 20.4R3-S9;
- 21.2 versions earlier than 21.2R3-S7;
- 21.3 versions earlier than 21.3R3-S5;
- 21.4 versions earlier than 21.4R3-S5;
- 22.1 versions earlier than 22.1R3-S4;
- 22.2 versions earlier than 22.2R3-S3;
- 22.3 versions earlier than 22.3R3-S1;
- 22.4 versions earlier than 22.4R3;
- 23.2 versions earlier than 23.2R1-S2, 23.2R2;
Junos OS Evolved:
- 20.4-EVO versions 20.4R1-EVO and later versions earlier than 20.4R3-S9-EVO;
- 21.2-EVO versions earlier than 21.2R3-S7-EVO;
- 21.3-EVO versions earlier than 21.3R3-S5-EVO;
- 21.4-EVO versions earlier than 21.4R3-S5-EVO;
- 22.1-EVO versions earlier than 22.1R3-S4-EVO;
- 22.2-EVO versions earlier than 22.2R3-S3-EVO;
- 22.3-EVO versions earlier than 22.3R3-S1-EVO;
- 22.4-EVO versions earlier than 22.4R3-EVO;
- 23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO;
This issue does not affect Juniper Networks
- Junos OS versions earlier than 20.4R1;
- Junos OS Evolved versions earlier than 20.4R1-EVO.
This is a related but separate issue than the one described in JSA79095.
- Record
EUVD-2024-19246- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-p5h3-wwqf-f5rv
An Improper Validation of Syntactic Correctness of Input vulnerability in the Routing Protocol...
An Improper Validation of Syntactic Correctness of Input vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).
If a BGP update is received over an established BGP session which contains a tunnel encapsulation attribute with a specifically malformed TLV, rpd will crash and restart.
This issue affects Juniper Networks Junos OS:
- 20.4 versions 20.4R1 and later versions earlier than 20.4R3-S9;
- 21.2 versions earlier than 21.2R3-S7;
- 21.3 versions earlier than 21.3R3-S5;
- 21.4 versions earlier than 21.4R3-S5;
- 22.1 versions earlier than 22.1R3-S4;
- 22.2 versions earlier than 22.2R3-S3;
- 22.3 versions earlier than 22.3R3-S1;
- 22.4 versions earlier than 22.4R3;
- 23.2 versions earlier than 23.2R1-S2, 23.2R2;
Junos OS Evolved:
- 20.4-EVO versions 20.4R1-EVO and later versions earlier than 20.4R3-S9-EVO;
- 21.2-EVO versions earlier than 21.2R3-S7-EVO;
- 21.3-EVO versions earlier than 21.3R3-S5-EVO;
- 21.4-EVO versions earlier than 21.4R3-S5-EVO;
- 22.1-EVO versions earlier than 22.1R3-S4-EVO;
- 22.2-EVO versions earlier than 22.2R3-S3-EVO;
- 22.3-EVO versions earlier than 22.3R3-S1-EVO;
- 22.4-EVO versions earlier than 22.4R3-EVO;
- 23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO;
This issue does not affect Juniper Networks
- Junos OS versions earlier than 20.4R1;
- Junos OS Evolved versions earlier than 20.4R1-EVO.
This is a related but separate issue than the one described in JSA79095.
- Record
GHSA-p5h3-wwqf-f5rv- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/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
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-1286
- Updated
- 2026-11-02
NVD
An Improper Validation of Syntactic Correctness of Input vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).
If a BGP update is received over an established BGP session which contains a tunnel encapsulation attribute with a specifically malformed TLV, rpd will crash and restart.
This issue affects Juniper Networks Junos OS:
- 20.4 versions 20.4R1 and later versions earlier than 20.4R3-S9;
- 21.2 versions earlier than 21.2R3-S7;
- 21.3 versions earlier than 21.3R3-S5;
- 21.4 versions earlier than 21.4R3-S5;
- 22.1 versions earlier than 22.1R3-S4;
- 22.2 versions earlier than 22.2R3-S3;
- 22.3 versions earlier than 22.3R3-S1;
- 22.4 versions earlier than 22.4R3;
- 23.2 versions earlier than 23.2R1-S2, 23.2R2;
Junos OS Evolved:
- 20.4-EVO versions 20.4R1-EVO and later versions earlier than 20.4R3-S9-EVO;
- 21.2-EVO versions earlier than 21.2R3-S7-EVO;
- 21.3-EVO versions earlier than 21.3R3-S5-EVO;
- 21.4-EVO versions earlier than 21.4R3-S5-EVO;
- 22.1-EVO versions earlier than 22.1R3-S4-EVO;
- 22.2-EVO versions earlier than 22.2R3-S3-EVO;
- 22.3-EVO versions earlier than 22.3R3-S1-EVO;
- 22.4-EVO versions earlier than 22.4R3-EVO;
- 23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO;
This issue does not affect Juniper Networks
- Junos OS versions earlier than 20.4R1;
- Junos OS Evolved versions earlier than 20.4R1-EVO.
This is a related but separate issue than the one described in JSA79095.
- Record
CVE-2024-21598- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/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
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-1286
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-21598 is a high vulnerability (CVSS 8.7) in Juniper Junos, published April 12, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.57%, the 47th percentile. No source names a fixed version.