How severe is CVE-2020-27338?

CVE-2020-27338 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2020-27338 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27338?

CVE-2020-27338 affects Treck Ipv6. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27338?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-27338 published?

CVE-2020-27338 was published on 2020-12-22 and last updated on 2026-06-17.

CVE-2020-27338

CVE-2020-27338 is a medium-severity vulnerability in Treck Ipv6 with a CVSS 3.x base score of 5.9. 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-20.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.8
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Treck Ipv6
Published: 2020-12-22
Last modified: 2026-06-17

Description

An issue was discovered in Treck IPv6 before 6.0.1.68. Improper Input Validation in the DHCPv6 client component allows an unauthenticated remote attacker to cause an Out of Bounds Read, and possibly a Denial of Service via adjacent network access.

Frequently asked questions

What is CVE-2020-27338?: An issue was discovered in Treck IPv6 before 6.0.1.68. Improper Input Validation in the DHCPv6 client component allows an unauthenticated remote attacker to cause an Out of Bounds Read, and possibly a Denial of Service via adjacent network access.
How severe is CVE-2020-27338?: CVE-2020-27338 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2020-27338 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27338?: CVE-2020-27338 affects Treck Ipv6. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27338?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-27338 published?: CVE-2020-27338 was published on 2020-12-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:treck:ipv6:*:*:*:*:*:*:*:*

More vulnerabilities in Treck Ipv6

CVE-2020-27337 — High (CVSS 7.3): An issue was discovered in Treck IPv6 before 6.0.1.68. Improper Input Validation in the IPv6 component allows an…
CVE-2020-27336 — Low (CVSS 3.7): An issue was discovered in Treck IPv6 before 6.0.1.68. Improper input validation in the IPv6 component when handling a…

All CVEs affecting Treck Ipv6 →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →