CVE-2021-37972Network attack vector

Browser crash via undersized Huffman lookup table

Published Oct 8, 2021 · Updated Aug 4, 2024

Out-of-bounds read in Google Chrome before 94.0.4606.54 allows remote attackers to crash the browser via a crafted HTML page. During malformed JPEG transformation, the 64-bit SSE2 Huffman encoder lets an nbits index exceed 32768 while its assembly lookup table has only 32768 entries. A user must load attacker-controlled page content on an affected x86-64 build; the documented direct consequence is browser termination.

CVSS severity8.8
High
EPSS probability1.79%
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 Google Chrome before 94.0.4606.54 allows remote attackers to crash the browser via a crafted HTML page. During malformed JPEG transformation, the 64-bit SSE2 Huffman encoder lets an nbits index exceed 32768 while its assembly lookup table has only 32768 entries. A user must load attacker-controlled page content on an affected x86-64 build; the documented direct consequence is browser termination.

The record

CVE
CVE-2021-37972
Published
Oct 8, 2021
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-125, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 8, 2021CVE 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 <94.0.4606.54

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <94.0.4606.54

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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
T1203Exploitation for Client Execution

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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