CASCACascade Atlas

Evidence dossier

CVE-2019-3568

A buffer overflow vulnerability in WhatsApp VOIP stack allowed remote code execution via specially crafted series of RTCP packets sent to a target phone number.

Exploited in the wild (CISA KEV since Apr 19, 2022). NVD reports CVSS 3.1 9.8. EPSS estimates 39.2% exploit likelihood as of Aug 26, 2026.

80.5–85.2Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

A buffer overflow vulnerability in WhatsApp VOIP stack allowed remote code execution via specially crafted series of RTCP packets sent to a target phone number. The issue affects WhatsApp for Android prior to v2.19.134, WhatsApp Business for Android prior to v2.19.44, WhatsApp for iOS prior to v2.19.51, WhatsApp Business for iOS prior to v2.19.51, WhatsApp for Windows Phone prior to v2.18.348, and WhatsApp for Tizen prior to v2.18.15.

State
PUBLISHED
Published
May 14, 2019
Updated
Oct 21, 2025
Evidence coverage
92%

Evidence chronology

What was known when

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  1. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    CVE Program

    Record text: CVE Program Container

    Inspect raw assertion
    Field
    container
    Value
    CVE Program Container
    Original evidence ↗
  3. Source dateSource date omittedFirst observed by CASCA
    facebook

    Record text: A buffer overflow vulnerability in WhatsApp VOIP stack allowed remote code execution via specially crafted series of RTCP packets sent to a target phone number. The issue affects WhatsApp for Android prior to v2.19.134, WhatsApp Business for Android prior to v2.19.44, WhatsApp for iOS prior to v2.19.51, WhatsApp Business for iOS prior to v2.19.51, WhatsApp for Windows Phone prior to v2.18.348, and WhatsApp for Tizen prior to v2.18.15.

    Inspect raw assertion
    Field
    container
    Value
    A buffer overflow vulnerability in WhatsApp VOIP stack allowed remote code execution via specially crafted series of RTCP packets sent to a target phone number. The issue affects WhatsApp for Android prior to v2.19.134, WhatsApp Business for Android prior to v2.19.44, WhatsApp for iOS prior to v2.19.51, WhatsApp Business for iOS prior to v2.19.51, WhatsApp for Windows Phone prior to v2.18.348, and WhatsApp for Tizen prior to v2.18.15.
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: WhatsApp VOIP Stack Buffer Overflow Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    WhatsApp VOIP Stack Buffer Overflow Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 39.17% probability · 98.49th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.391660000000; percentile 0.984850000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Apr 19, 2022 · first observed Jul 19, 2026

Exploit likelihood39.17%

FIRST EPSS · score date Aug 26, 2026 · 98.5th percentile · first observed Aug 26, 2026

SeverityCVSS 9.8

NVD · CVSS 3.1 · first observed Jul 19, 2026 · same-version scores align in this snapshot

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1
Exploitation statusEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Severity assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 2026
Resolution
None
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Aug 27, 2026
Resolution
Resolve identity

Source comparison

Who said what

CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CVE ProgramDerivative copy
Record text

CVE Program Container

Inspect raw assertion
Field
container
Value
CVE Program Container
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
facebookOriginal assertion
Record text

A buffer overflow vulnerability in WhatsApp VOIP stack allowed remote code execution via specially crafted series of RTCP packets sent to a target phone number. The issue affects WhatsApp for Android prior to v2.19.134, WhatsApp Business for Android prior to v2.19.44, WhatsApp for iOS prior to v2.19.51, WhatsApp Business for iOS prior to v2.19.51, WhatsApp for Windows Phone prior to v2.18.348, and WhatsApp for Tizen prior to v2.18.15.

Inspect raw assertion
Field
container
Value
A buffer overflow vulnerability in WhatsApp VOIP stack allowed remote code execution via specially crafted series of RTCP packets sent to a target phone number. The issue affects WhatsApp for Android prior to v2.19.134, WhatsApp Business for Android prior to v2.19.44, WhatsApp for iOS prior to v2.19.51, WhatsApp Business for iOS prior to v2.19.51, WhatsApp for Windows Phone prior to v2.18.348, and WhatsApp for Tizen prior to v2.18.15.
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

WhatsApp VOIP Stack Buffer Overflow Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
WhatsApp VOIP Stack Buffer Overflow Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

39.17% probability · 98.49th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.391660000000; percentile 0.984850000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
6Underlying assertions
2Canonical products
6Target assertions
0Constraint assertions

Grouped from 1 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

8 scope groups

facebook · source assertedFacebookWhatsApp Business for AndroidDirect source scope
Affected: 2.19.44Affected: unspecified to before 2.19.134 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "2.19.44"}, {"status": "affected", "version": "unspecified", "lessThan": "2.19.134", "versionType": "custom"}]
facebook · source assertedFacebookWhatsApp Business for iOSDirect source scope
Affected: 2.19.51Affected: unspecified to before 2.19.51 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "2.19.51"}, {"status": "affected", "version": "unspecified", "lessThan": "2.19.51", "versionType": "custom"}]
facebook · source assertedFacebookWhatsApp for AndroidDirect source scope
Affected: 2.19.134Affected: unspecified to before 2.19.134 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "2.19.134"}, {"status": "affected", "version": "unspecified", "lessThan": "2.19.134", "versionType": "custom"}]
facebook · source assertedFacebookWhatsApp for iOSDirect source scope
Affected: 2.19.51Affected: unspecified to before 2.19.51 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "2.19.51"}, {"status": "affected", "version": "unspecified", "lessThan": "2.19.51", "versionType": "custom"}]
facebook · source assertedFacebookWhatsApp for TizenDirect source scope
Affected: 2.18.15Affected: unspecified to before 2.18.15 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "2.18.15"}, {"status": "affected", "version": "unspecified", "lessThan": "2.18.15", "versionType": "custom"}]
facebook · source assertedFacebookWhatsApp for Windows PhoneDirect source scope
Affected: 2.18.348Affected: unspecified to before 2.18.348 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "2.18.348"}, {"status": "affected", "version": "unspecified", "lessThan": "2.18.348", "versionType": "custom"}]
NVD CPE · APPLICATIONwhatsappwhatsappVulnerable target · 4 assertions
Any version (unconstrained) (< 2.18.15); Any version (unconstrained) (< 2.18.348); Any version (unconstrained) (< 2.19.134); Any version (unconstrained) (< 2.19.51)Canonical identity product-5acab13ac246a84584f0c6ae6ef577aab00ee96d12331a968788aa326716a91fLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:windows_phone:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    through excluding 2.18.348
    Match ID
    449816d3-570f-47d7-a70d-9351a4a6f190
  2. cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:tizen:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    through excluding 2.18.15
    Match ID
    49a0c7e5-1c25-4ea2-9436-a7922acacb9b
  3. cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:iphone_os:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    through excluding 2.19.51
    Match ID
    84f1ba88-ba43-4857-b4c2-a32fa2937c11
  4. cpe:2.3:a:whatsapp:whatsapp:*:*:*:*:*:android:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    through excluding 2.19.134
    Match ID
    b36b6ff7-dc69-4a5c-9fe7-eb127e6d0aa1
NVD CPE · APPLICATIONwhatsappwhatsapp_businessVulnerable target · 2 assertions
Any version (unconstrained) (< 2.19.44); Any version (unconstrained) (< 2.19.51)Canonical identity product-566877caac9a8eedd487df6a7163b013608001dbed6aa9865eb8387cf6d96e1aLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:whatsapp:whatsapp_business:*:*:*:*:*:android:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    through excluding 2.19.44
    Match ID
    fb312499-524d-46a2-ab2c-5b96b84c2733
  2. cpe:2.3:a:whatsapp:whatsapp_business:*:*:*:*:*:iphone_os:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    through excluding 2.19.51
    Match ID
    f582a5fe-d7df-47ad-9785-9c7bf7606dd7

Affected-product evidence

Accepted scope and product mapping

2 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-b95afa17d98aee3ead08f2402bcd6a8c91d87b65192dc9217e286b9bf1453098 · product-566877caac9a8eedd487df6a7163b013608001dbed6aa9865eb8387cf6d96e1a

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
00e8211a-966f-4f71-b9bc-9b1b3014f65f6b1fad30-3da7-4836-807d-3414e99dff14
Mapping establishedEvidence supported

vendor-b95afa17d98aee3ead08f2402bcd6a8c91d87b65192dc9217e286b9bf1453098 · product-5acab13ac246a84584f0c6ae6ef577aab00ee96d12331a968788aa326716a91f

Source class
Nvd cpe vulnerable target
Assertions
4
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
31d28f66-3136-4903-a8a4-50c2af87c7fc78fc9a09-05ad-411c-a051-13ebce921748810f8b0a-35d2-405d-a8fd-63bbf03a75d08da28322-2838-4f76-bb42-c787de7b2891
Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
6
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
10d9a637-a504-4bfb-a854-f4aa5359a07834ea915e-23ca-47c1-a8ca-600a1497629f78304d5d-92ee-474b-b043-8b63eb944b5cce5b8532-a5a5-4351-aad6-d836d4753207fb0d02fc-a5fb-412f-9647-8a6d54620aa9fb12f0a1-71dd-4e40-a41e-90a0c0087122

Assessments

CVSS by origin

9.8
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8
CVE Program sourceCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8
CISA-ADPCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Direct CVE/CNA normalized decisions

9.8Priority eligible

CISA-ADP

CVSS 3.1 · Secondary · Independent enrichment · rank 2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Validation
Valid match
Recomputed
9.8
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.