Security readout for executives and security teams
Plain-English summary
Wire’s iOS transport layer failed to enforce certificate pinning on a newer websocket connection introduced for iOS 13+ users. This could weaken protection against network interception of websocket traffic. The issue is medium severity and the provided sources say certificate pinning is enforced in version 3.84 or later.
Executive priority
Treat this as a targeted mobile-client security update, not a crisis. Upgrade affected Wire iOS clients because the flaw weakens protection for collaboration traffic, but the supplied sources show medium severity and no confirmed active exploitation.
Technical view
CVE-2021-32755 affects wire-ios-transport as used by Wire iOS. The new websocket implementation introduced in the 3.82 iOS application was not configured to enforce certificate pinning when available. The issue maps to CWE-295 and has CVSS 3.1 score 5.4, with limited confidentiality and integrity impact.
Likely exposure
Exposure appears limited to Wire iOS users on the affected websocket implementation, specifically the supplied affected record listing wire-ios-transport version 3.8.2 and description referencing Wire iOS 3.82 on iOS 13 or higher.
Exploitation context
The supplied data does not indicate active exploitation, and KEV is false. Practical risk depends on an attacker’s ability to interfere with network trust paths for the websocket connection. The sources do not provide exploit evidence or broader affected-version detail.
Researcher notes
The public record is narrow: affected package, pinning gap, CVSS, CWE, and fixed version are identified. The bundle contains limited implementation detail, no exploit confirmation, and a version notation mismatch between Wire iOS 3.82 and affected transport 3.8.2.
Mitigation direction
- Upgrade Wire iOS components to version 3.84 or later.
- Check Wire’s GitHub advisory for any additional vendor guidance.
- Prioritize users running iOS 13 or higher with affected Wire iOS versions.
- Confirm mobile app distribution channels are delivering the fixed version.
Validation and detection
- Inventory deployed Wire iOS versions and identify 3.82 or listed affected transport builds.
- Verify upgraded clients are running version 3.84 or later.
- Review mobile device management records for stale Wire installations.
- Document whether certificate pinning is required by internal mobile security policy.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-295: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-32755 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N2.82.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/wireapp/wire-ios-transport/security/advisories/GHSA-v8mx-h3vj-w39vCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Certificate Validation
Improper Certificate Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.