CVE-2021-33970: Buffer Overflow vulnerability in Qihoo 360 Chrome v13.0.2170.0 allows attacker to escalate priveleges.

This week

CRITICAL 10.0REMOTEDOWNGRADE

CVE-2021-33970 is a critical-severity flaw (CVSS 10.0) affecting chrome. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer Overflow vulnerability in Qihoo 360 Chrome v13.0.2170.0 allows attacker to escalate priveleges.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-843
Published	2023-04-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: browser.360

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-04-19 22:15 UTCPublished CVE record published
2026-06-17 03:55 UTCUpdated Record last modified

browser.360 chrome DOWNGRADE

Affected: 13.0.2170.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 13.0.2170.0

1. Check installed version

apt-cache policy chrome || rpm -q chrome || chrome --version

2. No fixed release: DOWNGRADE to a release before 13.0.2170.0 (Debian / Ubuntu)

apt-cache madison chrome sudo apt install chrome=<VERSION_BEFORE_13.0.2170.0> sudo apt-mark hold chrome

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list chrome sudo dnf downgrade chrome-<VERSION_BEFORE_13.0.2170.0> sudo dnf versionlock add chrome

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-33970?

chrome: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-33970 being exploited?

CVE-2021-33970 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-33970 affect?

CVE-2021-33970 affects chrome. Severity is critical (CVSS 10.0). Buffer Overflow vulnerability in Qihoo 360 Chrome v13.0.2170.0 allows attacker to escalate priveleges.

How urgent is CVE-2021-33970?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Google Chrome vulnerabilities

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References

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