How severe is CVE-2019-14871?

CVE-2019-14871 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-14871 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-14871?

CVE-2019-14871 affects Newlib Project Newlib. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-14871?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-14871 published?

CVE-2019-14871 was published on 2020-03-18 and last updated on 2026-06-17.

CVE-2019-14871

CVE-2019-14871 is a medium-severity vulnerability in Newlib Project Newlib with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Newlib Project Newlib
Published: 2020-03-18
Last modified: 2026-06-17

Description

The REENT_CHECK macro (see newlib/libc/include/sys/reent.h) as used by REENT_CHECK_TM, REENT_CHECK_MISC, REENT_CHECK_MP and other newlib macros in versions prior to 3.3.0, does not check for memory allocation problems when the DEBUG flag is unset (as is the case in production firmware builds).

Frequently asked questions

What is CVE-2019-14871?: The REENT_CHECK macro (see newlib/libc/include/sys/reent.h) as used by REENT_CHECK_TM, REENT_CHECK_MISC, REENT_CHECK_MP and other newlib macros in versions prior to 3.3.0, does not check for memory allocation problems when the DEBUG flag is unset (as is the case in production firmware builds).
How severe is CVE-2019-14871?: CVE-2019-14871 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-14871 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-14871?: CVE-2019-14871 affects Newlib Project Newlib. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-14871?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-14871 published?: CVE-2019-14871 was published on 2020-03-18 and last updated on 2026-06-17.

References

https://census-labs.com/news/2020/01/31/multiple-null-pointer-dereference-vulnerabilities-in-newlib/

Affected products (1)

cpe:2.3:a:newlib_project:newlib:*:*:*:*:*:*:*:*

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