Junos OS Evolved: Improper Restriction of Communication Channel to Intended Endpoints
CVE-2024-47490 is a high-severity improper restriction of communication channel to intended endpoints vulnerability in Junos OS Evolved from Juniper Networks, with a CVSS 3.1 base score of 8.2 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 21.4R3-S9-EVO, 22.2R3-S4-EVO, 22.3R3-S3-EVO as the first without the flaw, so updating Junos OS Evolved to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.58% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Junos OS Evolved to 21.4R3-S9-EVO or 22.2R3-S4-EVO or 22.3R3-S3-EVO or 22.4R3-S2-EVO, whichever matches your release line, or a later version.
- Update junos_evolved to 21.4r3-s9-evo or 22.2r3-s4-evo or 22.3r3-s3-evo or 22.4r3-s2-evo, whichever matches your release line, or a later version.
- Read the advisory on supportportal.juniper.net for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Juniper Networks | Junos OS Evolved | before 21.4R3-S9-EVO; 22.2-EVO up to, but not including, 22.2R3-S4-EVO; 22.3-EVO up to, but not including, 22.3R3-S3-EVO; 22.4-EVO up to, but not including, 22.4R3-S2-EVO; 23.2-EVO up to, but not including, 23.2R2-EVO; 23.4-EVO up to, but not including, 23.4R1-S1-EVO, 23.4R2-EVO | 21.4R3-S9-EVO, 22.2R3-S4-EVO, 22.3R3-S3-EVO, 22.4R3-S2-EVO, 23.2R2-EVO, 23.4R1-S1-EVO, 23.4R2-EVO |
| Juniper Networks | junos_evolved | before 21.4r3-s9-evo; 22.2 up to, but not including, 22.2r3-s4-evo; 22.3 up to, but not including, 22.3r3-s3-evo; 22.4 up to, but not including, 22.4r3-s2-evo; 23.2 up to, but not including, 23.2r2-evo; 23.4 up to, but not including, 23.4r1-s1-evo; 23.4 up to, but not including, 23.4r2-evo | 21.4r3-s9-evo, 22.2r3-s4-evo, 22.3r3-s3-evo, 22.4r3-s2-evo, 23.2r2-evo, 23.4r1-s1-evo |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- LowLimited modification of data is possible.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H. Scored by CNA (juniper.net).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 7.7 | High | CNA (juniper.net) |
| CVSS 3.1 | 8.2 | High | CNA (juniper.net) |
Official description
An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on ACX 7000 Series allows an unauthenticated, network based attacker to cause increased consumption of resources, ultimately resulting in a Denial of Service (DoS). When specific transit MPLS packets are received by the PFE, these packets are internally forwarded to the Routing Engine (RE), rather than being handled appropriately. Continuous receipt of these MPLS packets causes resources to be exhausted. MPLS config is not required to be affected by this issue. This issue affects Junos OS Evolved ACX 7000 Series: * All versions before 21.4R3-S9-EVO, * 22.2-EVO before 22.2R3-S4-EVO, * 22.3-EVO before 22.3R3-S3-EVO, * 22.4-EVO before 22.4R3-S2-EVO, * 23.2-EVO before 23.2R2-EVO, * 23.4-EVO before 23.4R1-S1-EVO, 23.4R2-EVO.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Restriction of Communication Channel to Intended Endpoints
The product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it does not properly ensure that it is communicating with the correct endpoint.
More Improper Restriction of Communication Channel to Intended Endpoints vulnerabilities (CWE-923)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other vulnerabilities in Junos OS Evolved
- 9.8 Critical severity
- 9.8 Critical severity
- 8.8 High severity
- 8.8 High severity
- 7.5 High severity
- 7.5 High severity
Recent Improper Restriction of Communication Channel to Intended Endpoints vulnerabilities
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- 7.0 High severity
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- 7.8 High severity
- 9.1 Critical severity
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