CVE-2025-1991Network attack vector

Service interruption via packet-processing integer underflow

Published Jun 28, 2025 · Updated Aug 24, 2025

Integer underflow in IBM Informix Dynamic Server 12.10, 14.10, and 15.0 allows remote attackers to interrupt service via protocol packets. The server protocol packet-processing path performs integer arithmetic that underflows on attacker-controlled packet data, interrupting the database service. No authentication or user interaction is required; IBM has not disclosed whether exploitation hangs or crashes the service.

CVSS severity7.5
High
EPSS probability0.38%
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 IBM Informix Dynamic Server 12.10, 14.10, and 15.0 allows remote attackers to interrupt service via protocol packets. The server protocol packet-processing path performs integer arithmetic that underflows on attacker-controlled packet data, interrupting the database service. No authentication or user interaction is required; IBM has not disclosed whether exploitation hangs or crashes the service.

The record

CVE
CVE-2025-1991
Published
Jun 28, 2025
Updated
Aug 24, 2025
Vendor
IBM
Product
IBM Informix Dynamic Server
Classifications
CWE-191, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.10
  2. Affected versionversion=14.10
  3. Affected versionversion=15.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Informix Dynamic Serverversion=12.10; version=14.10; version=15.0

Published CVSS scores

7.5IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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