Junos OS: Improper Handling of Exceptional Conditions
CVE-2024-39525 is a high-severity improper handling of exceptional conditions vulnerability in Junos OS from Juniper Networks, with a CVSS 3.1 base score of 7.5 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 21.2R3-S8, 21.4R3-S8, 22.2R3-S4 as the first without the flaw, so updating Junos OS to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.43% 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 to 21.2R3-S8 or 21.4R3-S8 or 22.2R3-S4 or 22.3R3-S4, whichever matches your release line, or a later version.
- Update Junos OS Evolved to 21.2R3-S8-EVO or 21.4R3-S8-EVO or 22.2R3-S4-EVO or 22.3R3-S4-EVO, whichever matches your release line, or a later version.
- Update junos to 21.2r3-s8 or 21.4R3-s8 or 22.2R3-S4 or 22.3R3-S4, 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 | before 21.2R3-S8; 21.4 up to, but not including, 21.4R3-S8; 22.2 up to, but not including, 22.2R3-S4; 22.3 up to, but not including, 22.3R3-S4; 22.4 up to, but not including, 22.4R3-S3; 23.2 up to, but not including, 23.2R2-S1; 23.4 up to, but not including, 23.4R2 | 21.2R3-S8, 21.4R3-S8, 22.2R3-S4, 22.3R3-S4, 22.4R3-S3, 23.2R2-S1 |
| Juniper Networks | Junos OS Evolved | before 21.2R3-S8-EVO; 21.4-EVO up to, but not including, 21.4R3-S8-EVO; 22.2-EVO up to, but not including, 22.2R3-S4-EVO; 22.3-EVO up to, but not including, 22.3R3-S4-EVO; 22.4-EVO up to, but not including, 22.4R3-S3-EVO; 23.2-EVO up to, but not including, 23.2R2-S1-EVO; 23.4-EVO up to, but not including, 23.4R2-EVO; before 21.2r3-s8; and 6 more ranges | 21.2R3-S8-EVO, 21.4R3-S8-EVO, 22.2R3-S4-EVO, 22.3R3-S4-EVO, 22.4R3-S3-EVO, 23.2R2-S1-EVO |
| Juniper Networks | junos | before 21.2r3-s8; 21.4 up to, but not including, 21.4R3-s8; 22.2 up to, but not including, 22.2R3-S4; 22.3 up to, but not including, 22.3R3-S4; 22.4 up to, but not including, 22.4R3-S3; 23.2 up to, but not including, 23.2R2-S1; 23.4 up to, but not including, 23.4R2 | 21.2r3-s8, 21.4R3-s8, 22.2R3-S4, 22.3R3-S4, 22.4R3-S3, 23.2R2-S1 |
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
- NoneNothing can be modified.
- 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:N/A:H. Scored by CNA (juniper.net).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.7 | High | CNA (juniper.net) |
| CVSS 3.1 | 7.5 | High | CNA (juniper.net) |
Official description
An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker sending a specific 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. This issue only affects systems with BGP traceoptions enabled and requires a BGP session to be already established. Systems without BGP traceoptions enabled are not affected by 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 21.2R3-S8, * from 21.4 before 21.4R3-S8, * from 22.2 before 22.2R3-S4, * from 22.3 before 22.3R3-S4, * from 22.4 before 22.4R3-S3, * from 23.2 before 23.2R2-S1, * from 23.4 before 23.4R2; Junos OS Evolved: * All versions before 21.2R3-S8-EVO, * from 21.4-EVO before 21.4R3-S8-EVO, * from 22.2-EVO before 22.2R3-S4-EVO, * from 22.3-EVO before 22.3R3-S4-EVO, * from 22.4-EVO before 22.4R3-S3-EVO, * from 23.2-EVO before 23.2R2-S1-EVO, * from 23.4-EVO before 23.4R2-EVO.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Handling of Exceptional Conditions
The product does not handle or incorrectly handles an exceptional condition.
More Improper Handling of Exceptional Conditions vulnerabilities (CWE-755)
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 references
Other vulnerabilities in Junos OS
- 7.5 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 8.8 High severity
- 8.8 High severity
- 7.5 High severity
Recent Improper Handling of Exceptional Conditions vulnerabilities
- 7.5 High severity
- 7.1 High severity
- 7.5 High severity
- 7.8 High severity
- 8.8 High severity
- 8.8 High severity
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