What is CVE-2020-25289?

CVE-2020-25289 is a medium-severity vulnerability in Avast Secureline Vpn, classified under Improper Link Resolution Before File Access. CVSS score: 5.5/10. Published 2020-09-13.

How severe is CVE-2020-25289?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Avast Secureline Vpn

CVE-2020-25289

The VPN service in AVAST SecureLine before 5.6.4982.470 allows local users to write to arbitrary files via an Object Manager symbolic link from the log directory (which has weak permissions).

Published 2020-09-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.6% 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

Avast Secureline Vpn

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

zeifan.my/security/arbitrary file/eop/2020/07/21/avast-secureline-vpn-arb-file-… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-25289?: CVE-2020-25289 is a medium-severity vulnerability in Avast Secureline Vpn, classified under Improper Link Resolution Before File Access. CVSS score: 5.5/10. Published 2020-09-13.
How severe is CVE-2020-25289?: Medium severity. CVSS v3 base score is 5.5 out of 10.