Vulnerability Details : 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).
Products affected by CVE-2020-15679
- cpe:2.3:a:mozilla:vpn:*:*:*:*:*:android:*:*
- cpe:2.3:a:mozilla:vpn:*:*:*:*:*:windows:*:*
- cpe:2.3:a:mozilla:vpn:*:*:*:*:*:iphone_os:*:*
- cpe:2.3:a:mozilla:vpn:*:*:*:*:*:ipados:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-15679
0.32%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 52 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-15679
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.6
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H |
2.8
|
4.7
|
134c704f-9b21-4f2e-91b3-4a467353bcc0 | 2025-04-16 |
|
7.6
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H |
2.8
|
4.7
|
NIST |
CWE ids for CVE-2020-15679
-
Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.Assigned by:
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
- nvd@nist.gov (Primary)
References for CVE-2020-15679
-
https://www.mozilla.org/security/advisories/mfsa2020-48/
OAuth session fixation vulnerability in Mozilla VPN — MozillaVendor Advisory
-
https://github.com/mozilla-mobile/guardian-vpn-ios/commit/4309f5c9bd2c15cdfd39ac173665fad3f2598b54
PGAND-410 Resolve oauth session fixation on iOS (#272) · mozilla-mobile/guardian-vpn-ios@4309f5c · GitHubPatch;Third Party Advisory
-
https://github.com/mozilla-mobile/guardian-vpn-android/commit/981c840276ef3aee98cf5d42993d484ee99b28d9
New non-polling authentication flow. · mozilla-mobile/guardian-vpn-android@981c840 · GitHubPatch;Third Party Advisory
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https://github.com/mozilla-services/guardian-vpn-windows/commit/ac6f562973a83f6758cd7ab7aa313e863047d41b
New non-polling authentication flow. · mozilla-services/guardian-vpn-windows-deprecated@ac6f562 · GitHubPatch;Third Party Advisory
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