How severe is CVE-2019-15678?

CVE-2019-15678 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-2019-15678 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-15678?

CVE-2019-15678 affects Tightvnc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-15678?

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-2019-15678 published?

CVE-2019-15678 was published on 2019-10-29 and last updated on 2026-06-17.

CVE-2019-15678

CVE-2019-15678 is a critical-severity vulnerability in Tightvnc with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 13% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Tightvnc
Published: 2019-10-29
Last modified: 2026-06-17

Description

TightVNC code version 1.3.10 contains heap buffer overflow in rfbServerCutText handler, which can potentially result code execution.. This attack appear to be exploitable via network connectivity.

Frequently asked questions

What is CVE-2019-15678?: TightVNC code version 1.3.10 contains heap buffer overflow in rfbServerCutText handler, which can potentially result code execution.. This attack appear to be exploitable via network connectivity.
How severe is CVE-2019-15678?: CVE-2019-15678 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-2019-15678 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-15678?: CVE-2019-15678 affects Tightvnc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-15678?: 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-2019-15678 published?: CVE-2019-15678 was published on 2019-10-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:tightvnc:tightvnc:1.3.10:*:*:*:*:*:*:*

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