How severe is CVE-2020-11901?

CVE-2020-11901 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-11901 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 21% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-11901?

CVE-2020-11901 affects Treck Tcp/ip. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-11901?

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-2020-11901 published?

CVE-2020-11901 was published on 2020-06-17 and last updated on 2026-06-17.

CVE-2020-11901

CVE-2020-11901 is a critical-severity vulnerability in Treck Tcp/ip with a CVSS 3.x base score of 9.0. Its EPSS exploit-prediction score of 21% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.0)
CVSS v2: 9.3
EPSS exploit prediction: 21% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Treck Tcp/ip
Published: 2020-06-17
Last modified: 2026-06-17

Description

The Treck TCP/IP stack before 6.0.1.66 allows Remote Code execution via a single invalid DNS response.

Frequently asked questions

What is CVE-2020-11901?: The Treck TCP/IP stack before 6.0.1.66 allows Remote Code execution via a single invalid DNS response.
How severe is CVE-2020-11901?: CVE-2020-11901 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-11901 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 21% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-11901?: CVE-2020-11901 affects Treck Tcp/ip. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-11901?: 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-2020-11901 published?: CVE-2020-11901 was published on 2020-06-17 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Treck Tcp/ip

CVE-2020-25066 — Critical (CVSS 10.0): A heap-based buffer overflow in the Treck HTTP Server component before 6.0.1.68 allows remote attackers to cause a…
CVE-2020-11897 — Critical (CVSS 10.0): The Treck TCP/IP stack before 5.0.1.35 has an Out-of-Bounds Write via multiple malformed IPv6 packets.
CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.
CVE-2020-11898 — Critical (CVSS 9.1): The Treck TCP/IP stack before 6.0.1.66 improperly handles an IPv4/ICMPv4 Length Parameter Inconsistency, which might…
CVE-2020-11900 — High (CVSS 8.2): The Treck TCP/IP stack before 6.0.1.41 has an IPv4 tunneling Double Free.
CVE-2020-11904 — High (CVSS 7.3): The Treck TCP/IP stack before 6.0.1.66 has an Integer Overflow during Memory Allocation that causes an Out-of-Bounds…

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Other CWE-125 (Out-of-bounds Read) vulnerabilities

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CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
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