How severe is CVE-2019-15680?

CVE-2019-15680 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-15680 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-15680?

CVE-2019-15680 affects Tightvnc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-15680?

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

When was CVE-2019-15680 published?

CVE-2019-15680 was published on 2019-10-29 and last updated on 2026-06-17.

CVE-2019-15680

CVE-2019-15680 is a high-severity vulnerability in Tightvnc with a CVSS 3.x base score of 7.5. 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Tightvnc
Published: 2019-10-29
Last modified: 2026-06-17

Description

TightVNC code version 1.3.10 contains null pointer dereference in HandleZlibBPP function, which results Denial of System (DoS). This attack appear to be exploitable via network connectivity.

Frequently asked questions

What is CVE-2019-15680?: TightVNC code version 1.3.10 contains null pointer dereference in HandleZlibBPP function, which results Denial of System (DoS). This attack appear to be exploitable via network connectivity.
How severe is CVE-2019-15680?: CVE-2019-15680 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-15680 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-15680?: CVE-2019-15680 affects Tightvnc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-15680?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-15680 published?: CVE-2019-15680 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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