How severe is CVE-2020-11897?

CVE-2020-11897 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-11897 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-11897?

CVE-2020-11897 affects Treck Tcp/ip. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-11897?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-11897 published?

CVE-2020-11897 was published on 2020-06-17 and last updated on 2026-06-17.

CVE-2020-11897

CVE-2020-11897 is a critical-severity vulnerability in Treck Tcp/ip with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v2: 10.0
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Treck Tcp/ip
Published: 2020-06-17
Last modified: 2026-06-17

Description

The Treck TCP/IP stack before 5.0.1.35 has an Out-of-Bounds Write via multiple malformed IPv6 packets.

Frequently asked questions

What is CVE-2020-11897?: The Treck TCP/IP stack before 5.0.1.35 has an Out-of-Bounds Write via multiple malformed IPv6 packets.
How severe is CVE-2020-11897?: CVE-2020-11897 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-11897 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-11897?: CVE-2020-11897 affects Treck Tcp/ip. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-11897?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-11897 published?: CVE-2020-11897 was published on 2020-06-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:treck:tcp\/ip:*:*:*:*:*:*:*:*

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