CVE-2019-14871Network attack vector

Authenticated denial of service via unchecked allocation

Published Mar 18, 2020 · Updated Aug 5, 2024

NULL pointer dereference in Newlib before 3.3.0 allows remote authenticated users to cause a service interrupt via crafted input. The REENT_CHECK, REENT_CHECK_TM, REENT_CHECK_MISC and REENT_CHECK_MP macros continue execution after allocation failure when DEBUG is unset, allowing null state to reach dereferencing code. Exploitation requires a caller that supplies attacker-controlled data to these macros; the bounded consequence is a process or firmware service crash rather than confidentiality or integrity loss.

CVSS severity6.5
Medium
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Newlib before 3.3.0 allows remote authenticated users to cause a service interrupt via crafted input. The REENT_CHECK, REENT_CHECK_TM, REENT_CHECK_MISC and REENT_CHECK_MP macros continue execution after allocation failure when DEBUG is unset, allowing null state to reach dereferencing code. Exploitation requires a caller that supplies attacker-controlled data to these macros; the bounded consequence is a process or firmware service crash rather than confidentiality or integrity loss.

The record

CVE
CVE-2019-14871
Published
Mar 18, 2020
Updated
Aug 5, 2024
Vendor
Newlib Project
Product
Newlib
Classifications
CWE-476, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 2020CVE 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?

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

  1. Affected versionversion=all newlib versions prior to 3.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Newlib Project · Newlibversion=all newlib versions prior to 3.3.0

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5Red Hat CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NVDAV:N/AC:L/Au:S/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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