Vulnerability

CVE-2020-11899

Medium· 5.4KEVCVSS5.4EPSS35%

.rules3/5

Treck TCP/IP stack Out-of-Bounds Read Vulnerability

The Treck TCP/IP stack contains an IPv6 out-of-bounds read vulnerability.

Threat signal

69/100

Elevated

Severity

medium

CVSS

5.4

EPSS

35%

Active

KEV

CISA KEV — actively exploited

1549d overdue

AffectedTreck TCP/IP stack — IPv6

Added to KEV

2022-03-03

Federal patch due (BOD 22-01)

2022-03-17

Required action (CISA verbatim)

Apply updates per vendor instructions.

Vendor advisory + references

https://nvd.nist.gov/vuln/detail/CVE-2020-11899

CISA description: “The Treck TCP/IP stack contains an IPv6 out-of-bounds read vulnerability.”

CVSS

v3.1Open in FIRST calculator →

5.4/ 10MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Attack VectorAdjacentRequires same broadcast / collision domain (LAN, Bluetooth, MPLS).
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactNoneNo confidentiality impact.
Integrity ImpactLowSome data modification; attacker doesn't fully control extent.
Availability ImpactLowReduced performance / interruptions.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

35.3%

probability of exploitation in next 30 days

p97

higher than 97% of all CVEs

3-day trend↑ 0pp

Above the FIRST 'patch on a priority schedule' threshold.

Vendor VEX

No VEX statements published for CVE-2020-11899. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAttend

Active exploitation with limited impact — coordinate patching

exploitation: active
automatable: no
impact: partial
mission: support

Lifecycle

2022-03-03Added to CISA KEVransomware: Unknown
2022-03-03Published
2022-03-17Federal patch due (BOD 22-01)
2026-06-12Last modified1 source

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.