CVE-2025-1240: WinZip 7Z File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

This week

HIGH 8.8UPGRADE

CVE-2025-1240 is a high-severity flaw (CVSS 8.8) affecting winzip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WinZip 7Z File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of WinZip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of 7Z files. The issue results from the lack of proper validation of user-supplied data

Why this priority

High severity
EPSS top 4%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	10.3% (top 4%)
CISA exploited list	No
Weakness	CWE-787
Published	2025-02-11
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: winzip

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

Am I affected?

Timeline

2025-02-11 22:15 UTCPublished CVE record published
2026-06-17 08:38 UTCUpdated Record last modified

winzip winzip UPGRADE

Affected: >= 18.0 and < 18.0.16371 · >= 27.0 and < 27.0.16370 · >= 76.0 and < 76.8

Fixed in: 18.0.16371, 27.0.16370, 76.8

Safe to downgrade to: a release before 18.0

1. Check installed version

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

2. UPGRADE to 18.0.16371 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade winzip

Note

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

3. If no update is available yet, DOWNGRADE to a release before 18.0 (Debian / Ubuntu)

apt-cache madison winzip sudo apt install winzip=<VERSION_BEFORE_18.0> sudo apt-mark hold winzip

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list winzip sudo dnf downgrade winzip-<VERSION_BEFORE_18.0> sudo dnf versionlock add winzip

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-2025-1240?

winzip: upgrade to 18.0.16371, 27.0.16370, 76.8. Exact commands for each OS are on this page.

Is CVE-2025-1240 being exploited?

CVE-2025-1240 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-2025-1240 affect?

CVE-2025-1240 affects winzip. Severity is high (CVSS 8.8). WinZip 7Z File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of WinZip. User interaction is required to exploit this vulnerabi

How urgent is CVE-2025-1240?

Priority 55/100. High severity; EPSS top 4%: very likely to be exploited

Related CVEs

CVE-2024-8811 HIGH 7.8 UPGRADE WinZip Mark-of-the-Web Bypass Vulnerability

References

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