How severe is CVE-2020-12651?

CVE-2020-12651 has a CVSS 3.x base score of 9.8, 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-2020-12651 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12651?

CVE-2020-12651 affects Vandyke Securecrt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-12651?

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-2020-12651 published?

CVE-2020-12651 was published on 2020-05-15 and last updated on 2026-06-17.

CVE-2020-12651

CVE-2020-12651 is a critical-severity vulnerability in Vandyke Securecrt with a CVSS 3.x base score of 9.8. 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-190.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Vandyke Securecrt
Published: 2020-05-15
Last modified: 2026-06-17

Description

SecureCRT before 8.7.2 allows remote attackers to execute arbitrary code via an Integer Overflow and a Buffer Overflow because a banner can trigger a line number to CSI functions that exceeds INT_MAX.

Frequently asked questions

What is CVE-2020-12651?: SecureCRT before 8.7.2 allows remote attackers to execute arbitrary code via an Integer Overflow and a Buffer Overflow because a banner can trigger a line number to CSI functions that exceeds INT_MAX.
How severe is CVE-2020-12651?: CVE-2020-12651 has a CVSS 3.x base score of 9.8, 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-2020-12651 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12651?: CVE-2020-12651 affects Vandyke Securecrt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-12651?: 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-2020-12651 published?: CVE-2020-12651 was published on 2020-05-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:vandyke:securecrt:*:*:*:*:*:*:*:*

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