What is CVE-2020-15679?

CVE-2020-15679 is a high-severity vulnerability in Mozilla Vpn Android 1.1.0, classified under Session Fixation. CVSS score: 7.6/10. Published 2022-12-22.

How severe is CVE-2020-15679?

High severity. CVSS v3 base score is 7.6 out of 10.

Is CVE-2020-15679 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Mozilla Vpn Android 1.1.0

CVE-2020-15679

An OAuth session fixation vulnerability existed in the VPN login flow, where an attacker could craft a custom login URL, convince a VPN user to login via that URL, and obtain authenticated access as that user. This issue is limited to cases where attacker and victim are sharing the same source IP and could allow the ability to view session states and disconnect VPN sessions. This vulnerability affects Mozilla VPN iOS 1.0.7 < (929), Mozilla VPN Windows < 1.2.2, and Mozilla VPN Android 1.1.0 < (1360).

Published 2022-12-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H.

EPSS exploit prediction

EPSS: 0.005 (38.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Mozilla Vpn Android 1.1.0 — versions unspecified
Mozilla Vpn iOS 1.0.7 — versions unspecified
Mozilla Vpn Windows — versions unspecified
Mozilla Vpn

Weakness classification (CWE)

CWE-384 — Session Fixation

Public proof-of-concept exploits

Live-Hack-CVE/CVE-2020-15679

References

www.mozilla.org/security/advisories/mfsa2020-48/ (Vendor Advisory)
github.com/mozilla-services/guardian-vpn-windows/commit/ac6f562973a83f6758cd7ab… (Patch, Third Party Advisory)
github.com/mozilla-mobile/guardian-vpn-android/commit/981c840276ef3aee98cf5d429… (Patch, Third Party Advisory)
github.com/mozilla-mobile/guardian-vpn-ios/commit/4309f5c9bd2c15cdfd39ac173665f… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-15679?: CVE-2020-15679 is a high-severity vulnerability in Mozilla Vpn Android 1.1.0, classified under Session Fixation. CVSS score: 7.6/10. Published 2022-12-22.
How severe is CVE-2020-15679?: High severity. CVSS v3 base score is 7.6 out of 10.
Is CVE-2020-15679 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.