CVE-2020-9837Network attack vector

Remote memory disclosure via IPSec bounds failure

Published Jun 9, 2020 · Updated Aug 4, 2024

Out-of-bounds read in IPSec in Apple iOS, macOS, and tvOS allows remote attackers to leak memory through network traffic. The IPSec implementation reads past a buffer boundary when handling untrusted input because it does not perform sufficient bounds checking. Exposure is unauthenticated and network-reachable; affected releases include iOS before 13.5, macOS Catalina before 10.15.5, and tvOS before 13.4.5.

CVSS severity7.5
High
EPSS probability1.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in IPSec in Apple iOS, macOS, and tvOS allows remote attackers to leak memory through network traffic. The IPSec implementation reads past a buffer boundary when handling untrusted input because it does not perform sufficient bounds checking. Exposure is unauthenticated and network-reachable; affected releases include iOS before 13.5, macOS Catalina before 10.15.5, and tvOS before 13.4.5.

The record

CVE
CVE-2020-9837
Published
Jun 9, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
iOS
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <iOS 13.5 and iPadOS 13.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOSversion=unspecified <iOS 13.5 and iPadOS 13.5
Apple · tvOSversion=unspecified <tvOS 13.4.5
Apple · macOSversion=unspecified <macOS Catalina 10.15.5

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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