SRX series: Junos OS: SRX series using IPv6 Sun/MS-RPC ALGs may experience flowd crash on processing packets.
Published Oct 13, 2017
7.5
HIGHCVSS 3.0
EPSS 1.03%
Description
Any Juniper Networks SRX series device with one or more ALGs enabled may experience a flowd crash when traffic is processed by the Sun/MS-RPC ALGs. This vulnerability in the Sun/MS-RPC ALG services component of Junos OS allows an attacker to cause a repeated denial of service against the target. Repeated traffic in a cluster may cause repeated flip-flop failure operations or full failure to the flowd daemon halting traffic on all nodes. Only IPv6 traffic is affected by this issue. IPv4 traffic is unaffected. This issues is not seen with to-host traffic. This issue has no relation with HA services themselves, only the ALG service. No other Juniper Networks products or platforms are affected by this issue. Affected releases are Juniper Networks Junos OS 12.1X46 prior to 12.1X46-D55 on SRX; 12.1X47 prior to 12.1X47-D45 on SRX; 12.3X48 prior to 12.3X48-D32, 12.3X48-D35 on SRX; 15.1X49 prior to 15.1X49-D60 on SRX.
Affected products
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- Version 12.1X46 prior to 12.1X46-D55StatusaffectedConstraints-
- Version 12.3X48 prior to 12.3X48-D32, 12.3X48-D35StatusaffectedConstraints-
- Version 15.1X49 prior to 15.1X49-D60StatusaffectedConstraints-
- 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 |
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Configuration 1
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Configuration 2
Running on/with
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Configuration 3
Running on/with
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Configuration 4
Running on/with
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No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
Disable Sun/MS-RPC ALGs on the SRX Series device. Disable IPv6 on the device. example: deactivate interfaces xe-0/0/0 unit 0 family inet6 address 2000::254/64
Filtering incoming IPv6, or Sun/MS-RPC from the device is also an option. example:
set interfaces xe-0/0/0 unit 0 family inet6 filter input TEST ==> apply to interface set firewall family inet6 filter TEST term t1 from destination-port 135 set firewall family inet6 filter TEST term t1 then discard
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:L/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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.03% (0.01034) | 62.54th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.03% (0.01034) | 62.32th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.12% (0.00118) | 46.49th | v3 (v2023.03.01) |
| Jun 23, 2024 | 0.12% (0.00118) | 46.26th | v3 (v2023.03.01) |
| May 22, 2024 | 0.10% (0.00105) | 42.75th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.10% (0.00103) | 40.66th | 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 | 0.52% (0.00518) | 11.68th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.52% (0.00518) | 0.00th | v1 |
References (1)
- https://kb.juniper.net/JSA10811 x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://kb.juniper.net/JSA10811 | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.