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Exploited vulnerability · CISA KEV

Is CVE-2020-9818 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Apple iOS, iPadOS, and watchOS · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-9818, Apple iOS, iPadOS, and watchOS Out-of-Bounds Write Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 512 days after it was published. It affects Apple iOS, iPadOS, and watchOS. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity8.8CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline

What it is

Apple iOS, iPadOS, and watchOS Mail contains an out-of-bounds write vulnerability which may allow memory modification or application termination when processing a maliciously crafted mail message.

VendorApple (96 exploited CVEs in KEV)
ProductiOS, iPadOS, and watchOS
VulnerabilityApple iOS, iPadOS, and watchOS Out-of-Bounds Write Vulnerability
WeaknessCWE-787
Published9 Jun 2020
Added to KEV3 Nov 2021
Reported by (CNA)apple

What to do

  1. Check whether you run it. Look for iOS, iPadOS, and watchOS in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apple CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 9 Jun 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Apple.

Other exploited CVEs in iOS, iPadOS, and watchOS

References

Questions

Is CVE-2020-9818 being exploited?

Yes. CISA added CVE-2020-9818 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-9818 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2020-9818?

Apply updates per vendor instructions. Check Apple's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected iOS, iPadOS, and watchOS and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Apple scorecard · act-now radar.

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