CVE-2021-33592: NAVER Toolbar before 4.0.30.323 allows remote attackers to execute arbitrary code via a crafted upgrade.xml fi

Q: How do I fix CVE-2021-33592?

toolbar: upgrade to 4.0.30.323. Exact commands for each OS are on this page.

Q: Is CVE-2021-33592 being exploited?

CVE-2021-33592 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-33592 affect?

CVE-2021-33592 affects toolbar. Severity is critical (CVSS 9.8). NAVER Toolbar before 4.0.30.323 allows remote attackers to execute arbitrary code via a crafted upgrade.xml file. Special characters in filename parameter can be the cause of bypassing code signing check function.

Q: How urgent is CVE-2021-33592?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-33592 is a critical-severity flaw (CVSS 9.8) affecting toolbar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NAVER Toolbar before 4.0.30.323 allows remote attackers to execute arbitrary code via a crafted upgrade.xml file. Special characters in filename parameter can be the cause of bypassing code signing check function.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-20
Published	2021-07-19
Last modified	2026-06-17

Publisher (CNA): Naver Corporation · Vendor: naver

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

Am I affected?

Timeline

2021-07-19 06:15 UTCPublished CVE record published
2026-06-17 03:54 UTCUpdated Record last modified

naver toolbar UPGRADE

Affected: < 4.0.30.323

Fixed in: 4.0.30.323

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.0.30.323 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade toolbar

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade toolbar

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2021-33592?

toolbar: upgrade to 4.0.30.323. Exact commands for each OS are on this page.

Is CVE-2021-33592 being exploited?

CVE-2021-33592 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-2021-33592 affect?

CVE-2021-33592 affects toolbar. Severity is critical (CVSS 9.8). NAVER Toolbar before 4.0.30.323 allows remote attackers to execute arbitrary code via a crafted upgrade.xml file. Special characters in filename parameter can be the cause of bypassing code signing check function.

How urgent is CVE-2021-33592?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

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References

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