CVE-2023-49994Public exploit

Process crash via uninitialized pitch division

Published Dec 12, 2023 · Updated Nov 4, 2025

Floating-point exception in eSpeak NG 1.52-dev allows local users to crash speech synthesis by supplying a crafted input file. PeaksToHarmspect in wavegen.c divides during harmonic-spectrum generation after Wavegen can leave pitch uninitialized; the resulting zero divisor raises the exception. The affected local command or a consuming application must process the file, and the demonstrated consequence is termination of the synthesis process.

CVSS severity5.5
Medium
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

Floating-point exception in eSpeak NG 1.52-dev allows local users to crash speech synthesis by supplying a crafted input file. PeaksToHarmspect in wavegen.c divides during harmonic-spectrum generation after Wavegen can leave pitch uninitialized; the resulting zero divisor raises the exception. The affected local command or a consuming application must process the file, and the demonstrated consequence is termination of the synthesis process.

The record

CVE
CVE-2023-49994
Published
Dec 12, 2023
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-697, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-697Incorrect Comparison
T1499Endpoint Denial of Service

Public exploit references

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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