What is CVE-2023-1587?

CVE-2023-1587 is a medium-severity vulnerability in Avast Antivirus, classified under NULL Pointer Dereference. CVSS score: 5.8/10. Published 2023-04-19.

How severe is CVE-2023-1587?

Medium severity. CVSS v3 base score is 5.8 out of 10.

NULL pointer dereference in Avast Antivirus

CVE-2023-1587

Avast and AVG Antivirus for Windows were susceptible to a NULL pointer dereference issue via RPC-interface. The issue was fixed with Avast and AVG Antivirus version 22.11

Published 2023-04-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H.

EPSS exploit prediction

EPSS: 0.002 (10.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

support.norton.com/sp/static/external/tools/security-advisories.html (Third Party Advisory)

Frequently asked questions

What is CVE-2023-1587?: CVE-2023-1587 is a medium-severity vulnerability in Avast Antivirus, classified under NULL Pointer Dereference. CVSS score: 5.8/10. Published 2023-04-19.
How severe is CVE-2023-1587?: Medium severity. CVSS v3 base score is 5.8 out of 10.