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CVE-2016-1951

Multiple integer overflows in io/prprf.c in Mozilla Netscape Portable Runtime (NSPR) before 4.12...

8.6 HighFix available

CVE-2016-1951 is a high vulnerability (CVSS 8.6) in Mozilla Netscape Portable Runtime, published June 10, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.13%, the 87th percentile. Fixed in firefox-esr 45.0esr-1.

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
High

Exploit likelihood

3.13%Up 1.8 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 8.6

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.

Record
CVE-2016-1951
CVSS 3.0
8.6 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-190
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2016-1951
Updated
2026-11-02
EUVDEUVD-2016-3040 No score

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.

Record
EUVD-2016-3040
Updated
2026-11-03
GitHub AdvisoriesGHSA-2xc9-w6jv-x92w 8.6

Multiple integer overflows in io/prprf.c in Mozilla Netscape Portable Runtime (NSPR) before 4.12...

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.

Record
GHSA-2xc9-w6jv-x92w
CVSS 3.0
8.6 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weakness
CWE-190
Updated
2026-11-02
OSV 8.6

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.

Record
CVE-2016-1951
CVSS 3.0
8.6 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2016-1951 8.6

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.

Record
DEBIAN-CVE-2016-1951
CVSS 3.0
8.6 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2016-1951 8.6

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.

Record
UBUNTU-CVE-2016-1951
CVSS 3.0
8.6 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Updated
2026-11-02
OSVUSN-3023-1 No score

thunderbird vulnerabilities

It was discovered that NSPR incorrectly handled memory allocation. If a user were tricked in to opening a specially crafted message, an attacker could potentially exploit this to cause a denial of service via application crash, or execute arbitrary code. (CVE-2016-1951)

Christian Holler, Gary Kwong, Jesse Ruderman, Tyson Smith, Timothy Nikkel, Sylvestre Ledru, Julian Seward, Olli Pettay, and Karl Tomlinson, discovered multiple memory safety issues in Thunderbird. If a user were tricked in to opening a specially crafted message, an attacker could potentially exploit these to cause a denial of service via application crash, or execute arbitrary code. (CVE-2016-2818)

Record
USN-3023-1
Updated
2026-11-02
OSVUSN-3028-1 No score

nspr vulnerability

It was discovered that NSPR incorrectly handled memory allocation. A remote attacker could use this issue to cause NSPR to crash, resulting in a denial of service, or possibly execute arbitrary code.

Record
USN-3028-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
firefox-esr
Debian:12
before 45.0esr-1
45.0esr-1
firefox-esr
Debian:13
before 45.0esr-1
45.0esr-1
firefox-esr
Debian:14
before 45.0esr-1
45.0esr-1
nspr
Debian:12
before 2:4.12-1
2:4.12-1
nspr
Debian:13
before 2:4.12-1
2:4.12-1
nspr
Debian:14
before 2:4.12-1
2:4.12-1
nspr
Debian:7
before 2:4.9.2-1+deb7u4, plus listed versions
2:4.9.2-12:4.9.2-1+deb7u12:4.9.2-1+deb7u22:4.9.2-1+deb7u3
2:4.9.2-1+deb7u4
nspr
Debian:8
before 2:4.12-1+debu8u1, plus listed versions
2:4.10.10-12:4.10.7-12:4.10.7-1+deb8u12:4.10.7-1+x322:4.10.8-1
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2:4.10.8-22:4.10.9-12:4.10.9-22:4.11-12:4.12-1
2:4.12-1+debu8u1
nspr
Ubuntu:14.04:LTS
before 2:4.12-0ubuntu0.14.04.1, plus listed versions
2:4.9.5-1ubuntu12:4.9.5-1ubuntu22:4.10.2-1ubuntu12:4.10.2-1ubuntu1.12:4.10.7-0ubuntu0.14.04.12:4.10.10-0ubuntu0.14.04.1
2:4.12-0ubuntu0.14.04.1
thunderbird
Ubuntu:14.04:LTS
before 1:45.2.0+build1-0ubuntu0.14.04.3, plus listed versions
1:24.0+build1-0ubuntu11:24.0+build1-0ubuntu21:24.1.1+build1-0ubuntu0.13.10.11:24.1.1+build1-0ubuntu11:24.2.0+build1-0ubuntu1
Show 20 moreShow less
1:24.4.0+build1-0ubuntu11:24.5.0+build1-0ubuntu0.14.04.11:24.6.0+build1-0ubuntu0.14.04.11:31.0+build1-0ubuntu0.14.04.11:31.1.1+build1-0ubuntu0.14.04.11:31.1.2+build1-0ubuntu0.14.04.11:31.2.0+build2-0ubuntu0.14.04.11:31.3.0+build1-0ubuntu0.14.04.11:31.4.0+build1-0ubuntu0.14.04.11:31.5.0+build1-0ubuntu0.14.04.11:31.6.0+build1-0ubuntu0.14.04.11:31.7.0+build1-0ubuntu0.14.04.11:31.8.0+build1-0ubuntu0.14.04.11:38.2.0+build1-0ubuntu0.14.04.11:38.3.0+build1-0ubuntu0.14.04.11:38.4.0+build3-0ubuntu0.14.04.11:38.5.1+build2-0ubuntu0.14.04.11:38.6.0+build1-0ubuntu0.14.04.11:38.7.2+build1-0ubuntu0.14.04.11:38.8.0+build1-0ubuntu0.14.04.1
1:45.2.0+build1-0ubuntu0.14.04.3
nspr
Ubuntu:16.04:LTS
before 2:4.12-0ubuntu0.16.04.1, plus listed versions
2:4.10.8-2ubuntu12:4.10.10-1ubuntu12:4.11-1ubuntu1
2:4.12-0ubuntu0.16.04.1
thunderbird
Ubuntu:16.04:LTS
before 1:45.2.0+build1-0ubuntu0.16.04.1, plus listed versions
1:38.3.0+build1-0ubuntu21:38.5.1+build2-0ubuntu11:38.6.0+build1-0ubuntu11:38.7.2+build1-0ubuntu0.16.04.11:38.8.0+build1-0ubuntu0.16.04.1
1:45.2.0+build1-0ubuntu0.16.04.1

History

History
WhenChangedSources
2026-11-03aliasesEUVD
2026-11-02createdCVE List, GitHub Advisories, NVD, OSV

References

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