CVE-2019-25076

Exp

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.

Published: 2022-09-08 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-25076 is rated High Exploit Risk (64.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.77%). 3 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2019-25076

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2019-25076

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-19 1.72% 1.77% +0.05%
2 2026-06-15 0.68% 1.72% +1.04%
3 2025-11-21 — 0.68% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-25076

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.8 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 1.4 [email protected]

Weakness enumeration for CVE-2019-25076

OS Trackers for CVE-2019-25076

vendor priority summary link
alpine medium CVE-2019-25076: 1 source package rows (openvswitch); 11 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 11. https://security.alpinelinux.org/vuln/CVE-2019-25076
debian not yet assigned CVE-2019-25076 not yet assigned priority: Debian including 1 source packages (openvswitch), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5. https://security-tracker.debian.org/tracker/CVE-2019-25076
redhat medium — https://access.redhat.com/security/cve/CVE-2019-25076
ubuntu medium CVE-2019-25076 medium priority: Ubuntu including 1 source packages (openvswitch), 13 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): deferred 6, ignored 6, needs-triage 1. https://ubuntu.com/security/CVE-2019-25076

Affected software / configurations for CVE-2019-25076

Vendor Product Version Raw CPE
openvswitch openvswitch >= 2.0.0, <= 2.17.2 cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
openvswitch openvswitch 3.0.0 cpe:2.3:a:openvswitch:openvswitch:3.0.0:*:*:*:*:*:*:*

References for CVE-2019-25076

cvelogic Threat Intelligence