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CVE-1999-1055

7.5 · HIGH

Microsoft Excel 97 does not warn the user before executing worksheet functions, which could allow attackers to execute arbitrary commands by using the CALL function to execute a malicious DLL, aka…

Published Dec 31, 1999microsoftEPSS 7.02%

Overview

CVE-1999-1055 is a high-severity vulnerability affecting microsoft excel. It was published on December 31, 1999 and has a CVSS 2.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Microsoft Excel 97 does not warn the user before executing worksheet functions, which could allow attackers to execute arbitrary commands by using the CALL function to execute a malicious DLL, aka the Excel "CALL Vulnerability."

Remediation

Check the references section for vendor advisories and patches from microsoft. Update excel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refwww.securityfocus.com/bid/179Refdocs.microsoft.com/en-us/security-updates/securitybulletins/1998/ms98-018Refexchange.xforce.ibmcloud.com/vulnerabilities/1737Refwww.securityfocus.com/bid/179Refdocs.microsoft.com/en-us/security-updates/securitybulletins/1998/ms98-018Refexchange.xforce.ibmcloud.com/vulnerabilities/1737

How CyberStrike helps

Frequently asked questions

What is CVE-1999-1055?

CVE-1999-1055 is a high-severity vulnerability affecting microsoft excel. It was published on December 31, 1999 and has a CVSS 2.0 base score of 7.5 (HIGH).

How severe is CVE-1999-1055?

This vulnerability has a CVSS 2.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-1999-1055?

Check the references section for vendor advisories and patches from microsoft. Update excel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-1999-1055?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-1999-1055 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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