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HIGH

CVE-2021-21814

CVSS v3

7.8

HIGH

EPSS Score

0.3 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-22-223-03 CISA3 known affected

    Schneider Electric EcoStruxure, EcoStruxure Process Expert, SCADAPack RemoteConnect for x70

    EcoStruxure Control Expert: All versions (including former Unity Pro) prior to V15.1 HF001 · EcoStruxure Process Expert: All versions (including former HDCS) prior to V2021 · SCADAPack RemoteConnect for x70: All versions prior to R2.7.3

Full record on NVD

Description

Within the function HandleFileArg the argument filepattern is under control of the user who passes it in from the command line. filepattern is passed directly to strlen to determine the ending location of the char* passed in by the user, no checks are done to see if the passed in char* is longer than the staticly sized buffer data is memcpy‘d into, but after the memcpy a null byte is written to what is assumed to be the end of the buffer to terminate the char*, but without length checks, this null write occurs at an arbitrary offset from the buffer. An attacker can provide malicious input to trigger this vulnerability.

Technical details

Published
2021-08-13

Frequently asked questions

What is CVE-2021-21814?

Within the function HandleFileArg the argument filepattern is under control of the user who passes it in from the command line. filepattern is passed directly to strlen to determine the ending location of the char* passed in by the user, no checks are done to see if the passed in char* is longer than the staticly sized buffer data is memcpy‘d into, but after the memcpy a null byte is written to what is assumed to be the end of the buffer to terminate the char*, but without length checks, this null write occurs at an arbitrary offset from the buffer. An attacker can provide malicious input to trigger this vulnerability.

Is CVE-2021-21814 actively exploited?

Active exploitation of CVE-2021-21814 has not been confirmed. Its EPSS score was 0.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-21814?

CVE-2021-21814 has a CVSS v3 base score of 7.8 (HIGH severity).

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