CVE-2021-33970Public exploitNetwork attack vector

Privilege escalation via undisclosed buffer overflow

Published Apr 19, 2023 · Updated Feb 5, 2025

Buffer overflow in Qihoo 360 Chrome 13.0.2170.0 allows remote attackers to escalate privileges via network-delivered input. The public CVE record and linked disclosure do not identify the affected component, memory operation, or input that reaches the overflow. The published assessment treats the attack as unauthenticated and requiring no user interaction, while the linked artifact describes remote code execution with a sandbox escape; no more specific privilege boundary is disclosed.

CVSS severity10.0
Critical
EPSS probability3.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Qihoo 360 Chrome 13.0.2170.0 allows remote attackers to escalate privileges via network-delivered input. The public CVE record and linked disclosure do not identify the affected component, memory operation, or input that reaches the overflow. The published assessment treats the attack as unauthenticated and requiring no user interaction, while the linked artifact describes remote code execution with a sandbox escape; no more specific privilege boundary is disclosed.

The record

CVE
CVE-2021-33970
Published
Apr 19, 2023
Updated
Feb 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-843, T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

10.0CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
10.0NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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 exploitPublished

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1068Exploitation for Privilege Escalation

Public exploit references

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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