The TSS (Tuple Space Search) algorithm in Open vSwitch 2.x through 2.17.2 and 3.0.0…
Priority LOW 31Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
The TSS (Tuple Space Search) algorithm in Open vSwitch 2.x through 2.17.2 and 3.0.0 allows remote attackers to cause a denial of service (delays of legitimate traffic) via crafted packet data that requires excessive evaluation time within the packet classification algorithm for the MegaFlow cache, aka a Tuple Space Explosion (TSE) attack.
Why it matters now
EPSS 0.02408 84th percentileScored 2026-11-07
Public exploit Yes 3 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:* | 2.0.0 – 2.17.2 | Vulnerable | Openvswitch |
| cpe:2.3:a:openvswitch:openvswitch:3.0.0:*:*:*:*:*:*:* | 3.0.0 | Vulnerable | Openvswitch |
- cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:* Versions 2.0.0 – 2.17.2 Vulnerable ·Openvswitch
- cpe:2.3:a:openvswitch:openvswitch:3.0.0:*:*:*:*:*:*:* Versions 3.0.0 Vulnerable ·Openvswitch
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Fast Datapath for RHEL 7 | Affected | No fix planned: Will not fix |
| Fast Datapath for RHEL 8 | Affected | No fix planned: Out of support scope |
| Fast Datapath for RHEL 9 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
| Red Hat OpenStack Platform 13 (Queens) | Affected | No fix planned: Out of support scope |
Timeline
- 2026-10-02 Threatist record created from CVE-2019-25076
- 2026-10-03 Alias added: GHSA-8ch8-jcmf-3gj4
References
More Openvswitch vulnerabilities
- TI-2024-15067 openvswitch 2.17.8 was discovered to contain a memory leak via the function xmalloc__ in openvswitch-2.17.8/lib/util.c. CVSS 3.1HIGH 7.5
- TI-2016-01905 Buffer overflow in lib/flow.c in ovs-vswitchd in Open vSwitch 2.2.x and 2.3.x before… CVSS 3.0CRITICAL 9.8
- TI-2020-18020 Uncontrolled resource consumption in openvswitch CVSS 3.1HIGH 7.5
- TI-2017-06707 In Open vSwitch (OvS) v2.7.0, there is a buffer over-read while parsing the group mod… CVSS 3.0CRITICAL 9.8
- TI-2017-06706 In lib/conntrack.c in the firewall implementation in Open vSwitch (OvS) 2.6.1, there is a… CVSS 3.0CRITICAL 9.8
- TI-2017-06664 In Open vSwitch (OvS) 2.7.0, while parsing an OFPT_QUEUE_GET_CONFIG_REPLY type OFP 1.0… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2019-25076 · CVE Program
- CVE-2019-25076 · NVD
- FIRST EPSS
- GHSA-8ch8-jcmf-3gj4 · GitHub Advisory Database · CC BY 4.0
- CVE-2019-25076 · Red Hat security data · CC BY 4.0
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