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CVE-2020-9859

Exploited in the wild. In CISA KEV since 2021‑11‑03. Fixed versions are out.

CVSS 3.17.8HighEPSS percentile57th0.8% chance in 30 daysCISA KEVListedsince 2021-11-03, due 2022-05-03
No public exploit knownFix5 products5 fixed builds listed below

Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Apple iOSAffected: ≥ unspecified, < iOS 13.5.1 and iPadOS 13.5.1Upgrade to: iOS 13.5.1 and iPadOS 13.5.1Stated by: CVE record
  • Apple macOSAffected: ≥ unspecified, < macOS Catalina 10.15.5 Supplemental UpdateUpgrade to: macOS Catalina 10.15.5 Supplemental UpdateStated by: CVE record
  • Apple tvOSAffected: ≥ unspecified, < tvOS 13.4.6Upgrade to: tvOS 13.4.6Stated by: CVE record
  • Apple watchOSAffected: ≥ unspecified, < watchOS 6.2.6Upgrade to: watchOS 6.2.6Stated by: CVE record
  • Apple IpadosAffected: < 13.5.1Upgrade to: 13.5.1Stated by: NVD

Versions as the sources state them. Full version matrix after sign-in

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Coverage timeline

0 publishers

  1. Added to CISA KEV catalog

    ·CISA KEV

Sourced from public security reporting — each date is when it was published, not when it happened.

What it is

From the CVE record

A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5.1 and iPadOS 13.5.1, macOS Catalina 10.15.5 Supplemental Update, tvOS 13.4.6, watchOS 6.2.6. An application may be able to execute arbitrary code with kernel privileges.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS57th
CISA KEV
CISA KEV

Listed as exploited in the wild since 2021-11-03.

US federal agencies must remediate by 2022-05-03.

Apply updates per vendor instructions.
Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.8% chance of exploitation activity in the next 30 days, which ranks it in the 57th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Attention now

Rising.

Lifecycle

6 events over 1966 days, from the signal feeds we watch.

  1. Patch availablerecord updated
  2. Added to CISA KEV
  3. Publishedweakness classified, att&ck mapped

Affected products

And 9 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Scored 7.8 by NVD.

How it is reached

  • Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 1 more reference. See all after sign-in

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next exploited one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for iOS, not every advisory. This one: actively exploited.