CVE-2021-33972: Buffer Overflow vulnerability in Qihoo 360 Safe Browser v13.0.2170.0 allows attacker to escalate priveleges.

This week

CRITICAL 10.0REMOTEDOWNGRADE

CVE-2021-33972 is a critical-severity flaw (CVSS 10.0) affecting safe browser. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer Overflow vulnerability in Qihoo 360 Safe Browser 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	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-120
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 21:15 UTCPublished CVE record published
2026-06-17 03:55 UTCUpdated Record last modified

browser.360 safe browser DOWNGRADE

Affected: 12.3.1611.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.3.1611.0

1. Check installed version

apt-cache policy safe-browser || rpm -q safe-browser || safe-browser --version

2. No fixed release: DOWNGRADE to a release before 12.3.1611.0 (Debian / Ubuntu)

apt-cache madison safe-browser sudo apt install safe-browser=<VERSION_BEFORE_12.3.1611.0> sudo apt-mark hold safe-browser

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

dnf --showduplicates list safe-browser sudo dnf downgrade safe-browser-<VERSION_BEFORE_12.3.1611.0> sudo dnf versionlock add safe-browser

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-2021-33972?

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

Is CVE-2021-33972 being exploited?

CVE-2021-33972 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-2021-33972 affect?

CVE-2021-33972 affects safe browser. Severity is critical (CVSS 10.0). Buffer Overflow vulnerability in Qihoo 360 Safe Browser v13.0.2170.0 allows attacker to escalate priveleges.

How urgent is CVE-2021-33972?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-33975 CRITICAL 10.0 DOWNGRADE Buffer Overflow vulnerability in Qihoo 360 Total Security v10.8.0.1060 and v10.8.0.1213 allows attacker to esc

References

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