How severe is CVE-2019-19720?

CVE-2019-19720 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-19720 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-19720?

CVE-2019-19720 affects Yabasic. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-19720?

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-2019-19720 published?

CVE-2019-19720 was published on 2019-12-11 and last updated on 2026-06-17.

CVE-2019-19720

CVE-2019-19720 is a high-severity vulnerability in Yabasic with a CVSS 3.x base score of 8.8. 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-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Yabasic
Published: 2019-12-11
Last modified: 2026-06-17

Description

Yabasic 2.86.1 has a heap-based buffer overflow in the yylex() function in flex.c via a crafted BASIC source file.

Frequently asked questions

What is CVE-2019-19720?: Yabasic 2.86.1 has a heap-based buffer overflow in the yylex() function in flex.c via a crafted BASIC source file.
How severe is CVE-2019-19720?: CVE-2019-19720 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-19720 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-19720?: CVE-2019-19720 affects Yabasic. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-19720?: 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-2019-19720 published?: CVE-2019-19720 was published on 2019-12-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:yabasic:yabasic:2.86.1:*:*:*:*:*:*:*

More vulnerabilities in Yabasic

CVE-2019-19796 — High (CVSS 7.8): Yabasic 2.86.2 has a heap-based buffer overflow in myformat in function.c via a crafted BASIC source file.

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