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CVE-2020-15679

HIGH
7.6
CVSS Score
Published: December 22, 2022 at 12:00 AM UTC
Updated: June 17, 2026 at 02:57 AM UTC
1 product affected across 1 vendorVPN

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Severity
HIGH7.6
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

VPN· Mozilla
95%
v < (1360)v < (929)v < 1.0.7_\(929\)v < 1.2.21.0.7 ≤ v < 1.0.7_\(929\)1.1.0 ≤ v < 1.1.0_\(1360\)
Affected range stops below (1360), so it looks safe — our inference, not a vendor statement
Affected range stops below (929), so it looks safe — our inference, not a vendor statement
Affected range stops below 1.0.7_(929), so it looks safe — our inference, not a vendor statement
Affected range stops below 1.1.0_(1360), so it looks safe — our inference, not a vendor statement
Affected range stops below 1.2.2, so it looks safe — our inference, not a vendor statement

References (4)

PatchThird Party Advisory
Source: [email protected]
https://github.com/mozilla-mobile/guardian-vpn-android/commit/981c840276ef3aee98cf5d42993d484ee99b28d9
PatchThird Party Advisory
Source: [email protected]
https://github.com/mozilla-mobile/guardian-vpn-ios/commit/4309f5c9bd2c15cdfd39ac173665fad3f2598b54
PatchThird Party Advisory
Source: [email protected]
https://github.com/mozilla-services/guardian-vpn-windows/commit/ac6f562973a83f6758cd7ab7aa313e863047d41b
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-48/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.6HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-384

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