EUVD-2026-42707
GHSA-vhf9-x75x-qgv5
Severity by source
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X
Adjacent Layer 2 access needed (AV:A) with no auth or interaction (PR:N/UI:N); impact is pure availability from link saturation (A:H, C:N/I:N), no base scope change.
Primary rating from Vendor (juniper).
CVSS VectorVendor: juniper
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X
Lifecycle Timeline
7DescriptionCVE.org
An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on QFX10000 Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS).
On all QFX10000 platforms in an EVPN-VxLAN scenario, if an attacker sends IPv6 multicast traffic and these packets reach the non-IRB interface of a spine switch it floods the packet to other spines and all Ethernet Segment Identifier (ESI) leaf switches. This flooding causes the packet to be forwarded in a endless loop, which can lead to saturation of the involved links and in turn impact to legitimate traffic.
This issue affects Junos OS on QFX10000 Series:
- all versions before 23.2R2-S7,
- 23.4 versions before 23.4R2-S8,
- 24.2 versions before 24.2R2-S4,
- 24.4 versions before 24.4R2-S4.
This issue does not affect Junos version after 24.4 as the QFX10000 Series devices are not supported on newer versions anymore.
Articles & Coverage 1
AnalysisAI
Denial-of-service in Juniper Networks Junos OS on QFX10000 Series switches allows an unauthenticated, adjacent (Layer 2) attacker to saturate data-center links by injecting IPv6 multicast traffic in an EVPN-VxLAN fabric. When such packets reach a non-IRB interface of a spine switch, the packet-forwarding engine floods them to other spines and all ESI leaf switches, creating an endless forwarding loop that starves legitimate traffic. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a QFX10000 Series switch running an affected Junos OS release and deployed in an EVPN-VxLAN scenario. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 vector (AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L, score 7.1) describes a pure availability impact with no confidentiality or integrity loss, reachable without authentication or user interaction but only from an adjacent network position - the attacker must already have Layer 2 reachability to a spine's non-IRB interface inside the EVPN-VxLAN fabric. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with Layer 2 adjacency inside an EVPN-VxLAN data-center fabric (for example, from a compromised host, rogue leaf-connected device, or misconfigured port) sends crafted IPv6 multicast frames toward a non-IRB interface of a QFX10000 spine. The PFE floods the frames to peer spines and all ESI leaf switches and re-loops them endlessly, saturating fabric links and degrading or dropping legitimate traffic. … |
| Remediation | Upgrade Junos OS on QFX10000 Series to a fixed release: 23.2R2-S7 or later, 23.4R2-S8 or later, 24.2R2-S4 or later, or 24.4R2-S4 or later, per Juniper advisory JSA110080 (https://supportportal.juniper.net/JSA110080). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all QFX10000 Series switches deployed in EVPN-VxLAN environments and assess Layer 2 network access risks from adjacent network segments. …
Sign in for detailed remediation steps and compensating controls.
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