What is CVE-2021-1879?

CVE-2021-1879 is a medium-severity vulnerability in Apple Ios, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-02.

How severe is CVE-2021-1879?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-1879 known to be exploited?

Yes. CVE-2021-1879 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 5 public proof-of-concept repositories are indexed.

XSS in Apple Ios

CVE-2021-1879

This issue was addressed by improved management of object lifetimes. This issue is fixed in iOS 12.5.2, iOS 14.4.2 and iPadOS 14.4.2, watchOS 7.3.3. Processing maliciously crafted web content may lead to universal cross site scripting. App…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.071 (93.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Apple Ios — versions unspecified
Apple Ios And Ipados — versions unspecified
Apple Ipados
Apple Iphone_os
Apple Watchos — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2021-11-17.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

product-security@apple.com (x_refsource_MISC, Release Notes, Vendor Advisory)
product-security@apple.com (x_refsource_MISC, Release Notes, Vendor Advisory)
product-security@apple.com (x_refsource_MISC, Release Notes, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2021-1879?: CVE-2021-1879 is a medium-severity vulnerability in Apple Ios, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-02.
How severe is CVE-2021-1879?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-1879 known to be exploited?: Yes. CVE-2021-1879 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 5 public proof-of-concept repositories are indexed.