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CVE Record

CVE-2019-25076: The TSS (Tuple Space Search) algorithm in Open vSwitch 2.x through 2.17.2 and 3.0.0 allows remote attackers...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This CVE describes a remote denial-of-service risk in Open vSwitch. Specially crafted packet data can make the packet classification algorithm spend excessive time evaluating traffic, delaying legitimate packets. The business concern is network availability, especially where Open vSwitch carries production, tenant, or east-west service traffic.

Executive priority

Treat this as a production network availability issue. Prioritize environments where Open vSwitch handles critical or multi-tenant traffic, but avoid claiming active exploitation unless new evidence appears.

Technical view

Open vSwitch 2.x through 2.17.2 and 3.0.0 are listed as affected. The issue is in the TSS packet classification algorithm for the MegaFlow cache and is described as a Tuple Space Explosion attack, causing excessive evaluation time and traffic delays.

Likely exposure

Exposure is most likely where affected Open vSwitch versions process untrusted, tenant-controlled, or internet-adjacent packet flows. The bundle does not identify specific distributions, appliances, managed platforms, or patched builds.

Exploitation context

The CVE describes remote attackers using crafted packet data to cause denial of service. The source bundle does not cite active exploitation, and the CVE is not marked in KEV.

Researcher notes

Evidence is limited to the CVE description and Tuple Space Explosion references. No CVSS, CWE, patch version, or vendor remediation detail is included in the provided bundle, so validation should focus on version exposure and vendor guidance.

Mitigation direction

  • Inventory Open vSwitch deployments and identify versions in production traffic paths.
  • Prioritize systems running Open vSwitch 2.x through 2.17.2 or 3.0.0.
  • Check Open vSwitch or platform vendor guidance for fixed releases or supported mitigations.
  • Limit untrusted traffic reaching vulnerable switching paths where operationally feasible.
  • Increase monitoring for packet latency or unexplained forwarding delays.

Validation and detection

  • Confirm deployed Open vSwitch versions against the affected range.
  • Map which deployments process tenant, external, or untrusted traffic.
  • Review vendor advisories before declaring a system remediated.
  • Monitor for abnormal forwarding latency without generating crafted attack traffic.
  • Document compensating controls if an upgrade path is unavailable.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2019-25076 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.