CVE-2019-25051

Local memory corruption via oversized object-stack allocation

Published Jul 20, 2021 · Updated Aug 5, 2024

Heap-based buffer overflow in GNU Aspell 0.60.8 allows local users to corrupt memory through an oversized object-stack allocation. ObjStack::dup_top copies a string into a fixed-size chunk after the allocator creates a new chunk without verifying that the requested object fits. A low-privileged local process must reach StringMap::add through Config::lookup_list; the demonstrated consequence is an out-of-bounds heap write.

CVSS severity7.8
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in GNU Aspell 0.60.8 allows local users to corrupt memory through an oversized object-stack allocation. ObjStack::dup_top copies a string into a fixed-size chunk after the allocator creates a new chunk without verifying that the requested object fits. A low-privileged local process must reach StringMap::add through Config::lookup_list; the demonstrated consequence is an out-of-bounds heap write.

The record

CVE
CVE-2019-25051
Published
Jul 20, 2021
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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