MS-MPC or MS-MIC crash when passing large fragmented traffic through an ALG
Published Jul 14, 2017
5.9
MEDIUMCVSS 3.0
EPSS 1.10%
Description
An MS-MPC or MS-MIC Service PIC may crash when large fragmented packets are passed through an Application Layer Gateway (ALG). Repeated crashes of the Service PC can result in an extended denial of service condition. The issue can be seen only if NAT or stateful-firewall rules are configured with ALGs enabled. This issue was caused by the code change for PR 1182910 in Junos OS 14.1X55-D30, 14.1X55-D35, 14.2R7, 15.1R5, and 16.1R2. No other versions of Junos OS and no other Juniper Networks products or platforms are affected by this issue. Affected releases are Juniper Networks Junos OS on MX platforms running: 14.1X55 from 14.1X55-D30 to releases prior to 14.1X55-D35; 14.2R from 14.2R7 to releases prior to 14.2R7-S4, 14.2R8; 15.1R from 15.1R5 to releases prior to 15.1R5-S2, 15.1R6; 16.1R from 16.1R2 to releases prior to 16.1R3-S2, 16.1R4.
Affected products
-
- Version 14.1X55 from 14.1X55-D30 prior to 14.1X55-D35StatusaffectedConstraints-
- Version 14.2R from 14.2R7 prior to 14.2R7-S4, 14.2R8StatusaffectedConstraints-
- Version 15.1R from 15.1R5 prior to 15.1R5-S2, 15.1R6StatusaffectedConstraints-
- Version 16.1R from 16.1R2 prior to 16.1R3-S2, 16.1R4StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Juniper Networks | Junos OS | n/a |
|
- 14.1x55
- 14.1x55
- 14.2
- 14.2
- 14.2
- 14.2
- 14.2
- 14.2
- 14.2
- 14.2
- 15.1
- 15.1
- 15.1
- 15.1
- 15.1
- 15.1
- 15.1
- 16.1
- 16.1
- 16.1
- 16.1
- 16.1
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
There are no viable workarounds for this issue.
If NAT and stateful-firewall are not required, disabling them in the [edit applications] stanza will mitigate this issue.
It is good security practice to limit the exploitable attack surface of critical infrastructure networking equipment. Use access lists or firewall filters to limit access to the device from trusted, administrative networks or hosts.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:M/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.10% (0.01102) | 64.48th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.10% (0.01102) | 64.23th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.10% (0.00096) | 40.79th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.10% (0.00096) | 39.56th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.08% (0.00085) | 34.37th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.78% (0.00777) | 21.50th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.78% (0.00777) | 0.00th | v1 |
No CWE recorded.
References (2)
- http://www.securitytracker.com/id/1038895 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://kb.juniper.net/JSA10794 x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securitytracker.com/id/1038895 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://kb.juniper.net/JSA10794 | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.