What is CVE-2020-37109?

CVE-2020-37109 is a high-severity vulnerability in Asc Applied Software Consultants Timetables, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-02-07.

How severe is CVE-2020-37109?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Asc Applied Software Consultants Timetables

CVE-2020-37109

aSc TimeTables 2020.11.4 contains a denial of service vulnerability that allows attackers to crash the application by overwriting the Subject title field with a large buffer. Attackers can generate a 1000-character buffer and paste it into the Subject title to trigger an application crash and potential instability.

Vulnerability class: Buffer Overflow

Published 2026-02-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (29.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Asc Applied Software Consultants Timetables — versions 2020.11.4

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.exploit-db.com/exploits/48133 (exploit)
www.asctimetables.com/ (product)
www.vulncheck.com/advisories/asc-timetables-denial-of-service (third-party-advisory)

Frequently asked questions

What is CVE-2020-37109?: CVE-2020-37109 is a high-severity vulnerability in Asc Applied Software Consultants Timetables, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-02-07.
How severe is CVE-2020-37109?: High severity. CVSS v3 base score is 7.5 out of 10.