CVE-2021-44509

Local crash via underflowed memset size

Published Apr 15, 2022 · Updated Aug 4, 2024

Integer underflow in op_fnj3 in FIS GT.M 7.0-000 and earlier allows local users to crash the application with crafted M code. The function derives a byte count from attacker-controlled input and passes the underflowed size to memset, causing a segmentation fault. Reachability requires login access and the ability to modify executed M code; the documented consequence is a process crash, not data access or modification.

CVSS severity7.5
High
EPSS probability1.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in op_fnj3 in FIS GT.M 7.0-000 and earlier allows local users to crash the application with crafted M code. The function derives a byte count from attacker-controlled input and passes the underflowed size to memset, causing a segmentation fault. Reachability requires login access and the ability to modify executed M code; the documented consequence is a process crash, not data access or modification.

The record

CVE
CVE-2021-44509
Published
Apr 15, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-191, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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