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CVE Record

CVE-2021-32666: Asset DoS vulnerability

wire-ios is the iOS version of Wire, an open-source secure messaging app. In wire-ios versions 3.8.0 and prior, a vulnerability exists that can cause a denial of service between users. If a user has an invalid assetID for their profile picture and it contains the " character, it will cause the iOS client to crash. The vulnerability is patched in wire-ios version 3.8.1.

MediumCVSS 6.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This flaw can let a Wire user cause another user's iOS Wire app to crash through a malformed profile-picture asset identifier. It affects Wire for iOS versions 3.8.0 and earlier. The impact is denial of service, not data theft or message compromise, and the vendor states it is fixed in version 3.8.1.

Executive priority

Treat this as a moderate availability risk. It is unlikely to drive emergency response unless Wire is business-critical, but affected iOS clients should be updated promptly because the fix is available and the crash condition is remote and low complexity.

Technical view

CVE-2021-32666 is an input-validation issue in wire-ios profile picture asset handling. An invalid assetID containing a quote character can crash the iOS client. CVSS 3.1 is 6.5 with network attack vector, low complexity, low privileges required, no user interaction, and high availability impact only.

Likely exposure

Exposure is limited to organizations or users running Wire for iOS 3.8.0 or earlier. Managed iOS fleets with delayed app updates are the main concern. The source bundle does not identify other Wire clients, servers, or libraries as affected products.

Exploitation context

The CVE record does not list CISA KEV status, and the provided sources do not claim active exploitation. The scenario requires a Wire account context and affects availability by crashing the iOS client, rather than compromising confidentiality or integrity.

Researcher notes

The evidence supports a narrow CWE-20 input-validation flaw in wire-ios assetID handling. Public sources identify the affected range and patched version, but do not provide evidence of broader product impact, data compromise, or confirmed exploitation in the wild.

Mitigation direction

  • Update Wire for iOS to version 3.8.1 or later.
  • Prioritize managed iOS devices running Wire 3.8.0 or earlier.
  • Use MDM or app store controls to enforce supported Wire iOS versions.
  • Monitor Wire advisory channels if unsupported clients cannot be updated promptly.

Validation and detection

  • Inventory Wire for iOS versions across managed devices.
  • Confirm no managed iOS device remains on Wire 3.8.0 or earlier.
  • Review mobile crash telemetry for repeated Wire crashes tied to profile image handling.
  • Verify MDM policy or deployment records show Wire 3.8.1 or later.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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cwe · low confidence lookup

CWE-20: Exact CWE lookup

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cve · low confidence lookup

CVE-2021-32666 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
6.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.5Medium
CVSS 3.1 vector shape for CVE-2021-32666Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
wireappwire-ios<= 3.8.0Listed
Weakness

CWE details

CWE-20

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.