Medium severity · published Apr 12, 2024
CVE-2024-21590
Junos OS Evolved: Packets which are not destined to the device can reach the RE
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
An Improper Input Validation vulnerability in Juniper Tunnel Driver (jtd) and ICMP module of Juniper Networks Junos OS Evolved allows an unauthenticated attacker within the MPLS administrative domain to send specifically crafted packets to the Routing Engine (RE) to cause a Denial of Service (DoS).
When specifically crafted transit MPLS IPv4 packets are received by the Packet Forwarding Engine (PFE), these packets are internally forwarded to the RE. Continued receipt of these packets may create a sustained Denial of Service (DoS) condition.
This issue affects Juniper Networks Junos OS:
* All versions before 21.2R3-S8-EVO;
* from 21.4-EVO before 21.4R3-S6-EVO;
* from 22.2-EVO before 22.2R3-S4-EVO;
* from 22.3-EVO before 22.3R3-S3-EVO;
* from 22.4-EVO before 22.4R3-EVO;
* from 23.2-EVO before 23.2R2-EVO.
* from 23.4-EVO before 23.4R1-S1-EVO.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JO
Junos OS Evolved · Juniper Networks
before 21.2R3-S8-EVO; 21.4-EVO before 21.4R3-S6-EVO; 22.2-EVO before 22.2R3-S4-EVO; 22.3-EVO before 22.3R3-S3-EVO; 22.4-EVO before 22.4R3-EVO; 23.2-EVO before 23.2R2-EVO; +1 more · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-21590
CVE.org
https://www.cve.org/CVERecord?id=CVE-2024-21590
Vendor Advisory
https://supportportal.juniper.net/JSA75728
Issue Tracking
https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
More from Junos OS Evolved
9.8
CVE-2026-101954
Junos OS and Junos OS Evolved: Unauthenticated network access causes full device takeover when J-Web is enabled
9.8
CVE-2026-101983
Junos OS and Junos OS Evolved: An attacker causes remote code execution when J-Web virtual-domain is configured
9.8
CVE-2026-101982
Junos OS and Junos OS Evolved: A EVPN peer causes an rpd crash or root-level compromise when EVPN-VPWS is used
9.8
CVE-2026-33796
Junos OS and Junos OS Evolved: An attacker causes remote root command execution when BMP route monitoring is enabled
9.8
CVE-2026-33789
Junos OS and Junos OS Evolved: With BGP Monitoring Protocol is enabled, receipt of a specifically crafted BGP route update results in denial of service