CVE-2021-24027

HIGHNVD 7.57.5—

7.5

A cache configuration issue prior to WhatsApp for Android v2.21.4.18 and WhatsApp Business for Android v2.21.4.18 may have allowed a third party with access to the device’s external storage to read cached TLS material.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 90.9%
KEV: Not listed

Published

April 6, 2021

Last Modified

November 21, 2024

References (2)

cve-assign@fbhttps://www.whatsapp.com/security/advisories/2021/
af854a3a-2127-422b-91ae-364da2661108https://www.whatsapp.com/security/advisories/2021/

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-26 18:40 UTCEG score recompute
2026-05-26 18:40 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:49 UTCepss_batch

Frequently asked(5)

What is CVE-2021-24027?

CVE-2021-24027 is a high vulnerability published on April 6, 2021. A cache configuration issue prior to WhatsApp for Android v2.21.4.18 and WhatsApp Business for Android v2.21.4.18 may have allowed a third party with access to the device’s external storage to read cached TLS material.

When was CVE-2021-24027 disclosed?

CVE-2021-24027 was first published in the National Vulnerability Database on April 6, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-24027 actively exploited?

CVE-2021-24027 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-24027?

CVE-2021-24027 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-24027?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-24027, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-24027

Explore →

Is Your Infrastructure Affected by CVE-2021-24027?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2021-24027

📅 Published

🔄 Last Modified

🔗 References (2)