CVE-2021-24043

A missing bound check in RTCP flag parsing code prior to WhatsApp for Android v2.21.23.2, WhatsApp Business for Android v2.21.23.2, WhatsApp for iOS v2.21.230.6, WhatsApp Business for iOS 2.21.230.7, and WhatsApp Desktop v2.2145.0 could have allowed an out-of-bounds heap read if a user sent a malformed RTCP packet during an established call.

Published: 2022-02-02 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-24043 is rated Moderate Risk (58.4/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.10%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-24043

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.57% 1.10% +0.54%
2 2025-09-29 0.79% 0.57% -0.22%
3 2025-07-12 — 0.79% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-24043

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2021-24043

Affected software / configurations for CVE-2021-24043

Vendor Product Version Raw CPE
whatsapp whatsapp 2.21.23.2 cpe:2.3:a:whatsapp:whatsapp:2.21.23.2:*:*:*:*:android:*:*
whatsapp whatsapp 2.21.230.6 cpe:2.3:a:whatsapp:whatsapp:2.21.230.6:*:*:*:*:iphone_os:*:*
whatsapp whatsapp 2.2145.0 cpe:2.3:a:whatsapp:whatsapp:2.2145.0:*:*:*:desktop:*:*:*
whatsapp whatsapp_business 2.21.23.2 cpe:2.3:a:whatsapp:whatsapp_business:2.21.23.2:*:*:*:*:android:*:*
whatsapp whatsapp_business 2.21.230.7 cpe:2.3:a:whatsapp:whatsapp_business:2.21.230.7:*:*:*:*:iphone_os:*:*

References for CVE-2021-24043

cvelogic Threat Intelligence