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Fencer Vulns
high 8.6

CVE-2016-1951 json

Multiple integer overflows in io/prprf.c in Mozilla Netscape Portable Runtime (NSPR) before 4.12 allow remote attackers to cause a denial o…

published 2016-08-07 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-3040

cvss
8.6
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

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.

Patch / fix

  • nspr Debian 14, Debian 13, Debian 12 2:4.12-1
  • firefox-esr Debian 14, Debian 13, Debian 12 45.0esr-1

debian advisories DEBIAN-CVE-2016-1951

  • nspr Ubuntu 14.04 LTS 2:4.12-0ubuntu0.14.04.1
  • nspr Ubuntu 16.04 LTS 2:4.12-0ubuntu0.16.04.1
  • thunderbird Ubuntu 14.04 LTS 1:45.2.0+build1-0ubuntu0.14.04.3
  • thunderbird Ubuntu 16.04 LTS 1:45.2.0+build1-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2016-1951

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nspr Arch Linux 4.12-1

arch linux advisories AVG-933

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-1951 updated cvss 6.8

nspr: Memory allocation issue related to PR_*printf functions

  • Red Hat Enterprise Linux 5 nspr Red Hat Enterprise Linux 6 nspr Red Hat Enterprise Linux 7 nspr
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.13% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 8.6 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.