CVE-2020-15679 json
An OAuth session fixation vulnerability existed in the VPN login flow, where an attacker could craft a custom login URL, convince a VPN use…
published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2020-7666
- cvss
- 7.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 43%
- public exploits
- 0
- none known
Summary
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).
Patch / fix
- Mozilla Mozilla VPN iOS 1.0.7 (929)
- Mozilla Mozilla VPN Windows 1.2.2
- Mozilla Mozilla VPN Android 1.1.0 (1360)
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 18 mo ago
Exploit prediction
0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H |
| NVD | 3.1 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H |
| CNA | 3.1 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H |
Affected products
- Mozilla Mozilla VPN iOS 1.0.7
- Mozilla Mozilla VPN Windows
- Mozilla Mozilla VPN Android 1.1.0
Classification
- Weakness
-
- CWE-384 Session Fixation
References
-
github.com
/mozilla-services/guardian-vpn-windows/commit/ac6f562973a83f6758cd7ab7aa313e863047d41b
patch, third-party-advisory
-
github.com
/mozilla-mobile/guardian-vpn-android/commit/981c840276ef3aee98cf5d42993d484ee99b28d9
patch, third-party-advisory
-
github.com
/mozilla-mobile/guardian-vpn-ios/commit/4309f5c9bd2c15cdfd39ac173665fad3f2598b54
patch, third-party-advisory
-
mozilla.org
/security/advisories/mfsa2020-48/
vendor-advisory
Sources
- CVE List CVE-2020-15679
- NVD CVE-2020-15679
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