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ExploitedIn CISA KEVFix available

CVE-2021-30900

Exploitation confirmed. First attested on 2023-03-30 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2021-08-24
  • Fixed in14.8.1
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

Timeline

dates in UTC
  1. 2021-08-2419:15CVE publishedNVD
  2. 2023-03-30Added to the CISA KEV catalogCISA KEV
  3. 2023-03-30Listed as exploited by GCVEGCVE
  4. 2023-03-30Exploitation first reportedCISA KEV
  5. 2025-01-2917:29SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-30900?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-30900?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Apple ipados
BranchAffectedFixed in
14.8< 14.8.114.8.1
15.0= 15.0no fix published
Apple iphone os
BranchAffectedFixed in
14.8< 14.8.114.8.1
15.0= 15.0no fix published
Apple macos
BranchAffectedFixed in
11.6< 11.6.111.6.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As apple, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Apple iOS and iPadOS
    Affected
    • < 15.1fixed in 15.1custom
  • Apple iOS and iPadOS
    Affected
    • < 14.8fixed in 14.8custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2022-01-20

Fix

  1. Update Apple ipados to 14.8.1
  2. CISA’s required action: Apply updates per vendor instructions.due 2023-04-20

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2023-03-30
Patch Due Date
2023-04-20
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

  • CISA KEVKEV entry2023-03-30
  • ENISA EUVDexploitation2023-03-302023-03-30
  • GCVEexploitation2023-03-30
  • CISA-ADPSSVC decisionactive2025-01-29
  • OpenCVESSVC decisionactive—
  • CISA-ADPCVSS 3.17.82025-01-29
  • NVDCVSS 3.17.8read 2026-10-23
  • NVDCVSS 2.09.3read 2026-10-23
  • CISA-ADPweakness (CWE)CWE-7872025-01-29
  • NVDweakness (CWE)CWE-787read 2026-10-23
  • FIRST EPSSEPSS score5.2 %2026-11-02

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2021-08-24
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2021-30900?

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

Is CVE-2021-30900 actively exploited?

Yes. CVE-2021-30900 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-04-20.

What is the CVSS score for CVE-2021-30900?

CVE-2021-30900 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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