How severe is CVE-2016-1951?

CVE-2016-1951 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.

Is CVE-2016-1951 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-1951?

CVE-2016-1951 affects Mozilla Netscape Portable Runtime. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-1951?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-1951 published?

CVE-2016-1951 was published on 2016-08-07 and last updated on 2026-06-17.

CVE-2016-1951

CVE-2016-1951 is a high-severity vulnerability in Mozilla Netscape Portable Runtime with a CVSS 3.x base score of 8.6. 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-190.

Key facts

Severity: High (CVSS 3.x base score 8.6)
CVSS v2: 7.5
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Mozilla Netscape Portable Runtime
Published: 2016-08-07
Last modified: 2026-06-17

Description

Multiple integer overflows in io/prprf.c in Mozilla Netscape Portable Runtime (NSPR) before 4.12 allow remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact via a long string to a PR_*printf function.

Frequently asked questions

What is CVE-2016-1951?: Multiple integer overflows in io/prprf.c in Mozilla Netscape Portable Runtime (NSPR) before 4.12 allow remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact via a long string to a PR_*printf function.
How severe is CVE-2016-1951?: CVE-2016-1951 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.
Is CVE-2016-1951 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-1951?: CVE-2016-1951 affects Mozilla Netscape Portable Runtime. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-1951?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-1951 published?: CVE-2016-1951 was published on 2016-08-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mozilla:netscape_portable_runtime:*:*:*:*:*:*:*:*

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