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CVE-2017-7963

** DISPUTED ** The GNU Multiple Precision Arithmetic Library (GMP) interfaces for PHP through 7.1...

7.5 HighDisputed

The GNU Multiple Precision Arithmetic Library (GMP) interfaces for PHP through 7.1.4 allow attackers to cause a denial of service (memory consumption and application crash) via operations on long strings. NOTE: the vendor disputes this, stating "There is no security issue here, because GMP safely aborts in case of an OOM condition. The only attack vector here is denial of service. However, if you allow attacker-controlled, unbounded allocations you have a DoS vector regardless of GMP's OOM behavior.

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
None
Integrity
None
Availability
High

Exploit likelihood

2.00%Up 1.5 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

The GNU Multiple Precision Arithmetic Library (GMP) interfaces for PHP through 7.1.4 allow attackers to cause a denial of service (memory consumption and application crash) via operations on long strings. NOTE: the vendor disputes this, stating "There is no security issue here, because GMP safely aborts in case of an OOM condition. The only attack vector here is denial of service. However, if you allow attacker-controlled, unbounded allocations you have a DoS vector regardless of GMP's OOM behavior.

Record
CVE-2017-7963
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-770
Updated
2026-11-02
CVE List No score

The GNU Multiple Precision Arithmetic Library (GMP) interfaces for PHP through 7.1.4 allow attackers to cause a denial of service (memory consumption and application crash) via operations on long strings. NOTE: the vendor disputes this, stating "There is no security issue here, because GMP safely aborts in case of an OOM condition. The only attack vector here is denial of service. However, if you allow attacker-controlled, unbounded allocations you have a DoS vector regardless of GMP's OOM behavior.

Record
CVE-2017-7963
Updated
2026-11-02
EUVDEUVD-2017-16933 No score

The GNU Multiple Precision Arithmetic Library (GMP) interfaces for PHP through 7.1.4 allow attackers to cause a denial of service (memory consumption and application crash) via operations on long strings. NOTE: the vendor disputes this, stating "There is no security issue here, because GMP safely aborts in case of an OOM condition. The only attack vector here is denial of service. However, if you allow attacker-controlled, unbounded allocations you have a DoS vector regardless of GMP's OOM behavior.

Record
EUVD-2017-16933
Updated
2026-11-03
GitHub AdvisoriesGHSA-266p-jjrg-gmfx 7.5

** DISPUTED ** The GNU Multiple Precision Arithmetic Library (GMP) interfaces for PHP through 7.1...

** DISPUTED ** The GNU Multiple Precision Arithmetic Library (GMP) interfaces for PHP through 7.1.4 allow attackers to cause a denial of service (memory consumption and application crash) via operations on long strings. NOTE: the vendor disputes this, stating "There is no security issue here, because GMP safely aborts in case of an OOM condition. The only attack vector here is denial of service. However, if you allow attacker-controlled, unbounded allocations you have a DoS vector regardless of GMP's OOM behavior."

Record
GHSA-266p-jjrg-gmfx
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-770
Updated
2026-11-02
OSVBELL-CVE-2017-7963 7.5

CVE-2017-7963 does not affect BellSoft software

Record
BELL-CVE-2017-7963
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSV 7.5

The GNU Multiple Precision Arithmetic Library (GMP) interfaces for PHP through 7.1.4 allow attackers to cause a denial of service (memory consumption and application crash) via operations on long strings. NOTE: the vendor disputes this, stating "There is no security issue here, because GMP safely aborts in case of an OOM condition. The only attack vector here is denial of service. However, if you allow attacker-controlled, unbounded allocations you have a DoS vector regardless of GMP's OOM behavior.

Record
CVE-2017-7963
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2017-7963 7.5

The GNU Multiple Precision Arithmetic Library (GMP) interfaces for PHP through 7.1.4 allow attackers to cause a denial of service (memory consumption and application crash) via operations on long strings. NOTE: the vendor disputes this, stating "There is no security issue here, because GMP safely aborts in case of an OOM condition. The only attack vector here is denial of service. However, if you allow attacker-controlled, unbounded allocations you have a DoS vector regardless of GMP's OOM behavior.

Record
UBUNTU-CVE-2017-7963
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
php5
Ubuntu:Pro:14.04:LTS
All versions, plus listed versions
5.5.3+dfsg-1ubuntu25.5.3+dfsg-1ubuntu35.5.6+dfsg-1ubuntu15.5.6+dfsg-1ubuntu25.5.8+dfsg-2ubuntu1
Show 44 moreShow less
5.5.9+dfsg-1ubuntu15.5.9+dfsg-1ubuntu25.5.9+dfsg-1ubuntu35.5.9+dfsg-1ubuntu45.5.9+dfsg-1ubuntu4.15.5.9+dfsg-1ubuntu4.25.5.9+dfsg-1ubuntu4.35.5.9+dfsg-1ubuntu4.45.5.9+dfsg-1ubuntu4.55.5.9+dfsg-1ubuntu4.65.5.9+dfsg-1ubuntu4.75.5.9+dfsg-1ubuntu4.95.5.9+dfsg-1ubuntu4.115.5.9+dfsg-1ubuntu4.125.5.9+dfsg-1ubuntu4.135.5.9+dfsg-1ubuntu4.145.5.9+dfsg-1ubuntu4.165.5.9+dfsg-1ubuntu4.175.5.9+dfsg-1ubuntu4.195.5.9+dfsg-1ubuntu4.205.5.9+dfsg-1ubuntu4.215.5.9+dfsg-1ubuntu4.225.5.9+dfsg-1ubuntu4.235.5.9+dfsg-1ubuntu4.245.5.9+dfsg-1ubuntu4.255.5.9+dfsg-1ubuntu4.265.5.9+dfsg-1ubuntu4.275.5.9+dfsg-1ubuntu4.295.5.9+dfsg-1ubuntu4.29+esm15.5.9+dfsg-1ubuntu4.29+esm25.5.9+dfsg-1ubuntu4.29+esm35.5.9+dfsg-1ubuntu4.29+esm45.5.9+dfsg-1ubuntu4.29+esm55.5.9+dfsg-1ubuntu4.29+esm65.5.9+dfsg-1ubuntu4.29+esm85.5.9+dfsg-1ubuntu4.29+esm105.5.9+dfsg-1ubuntu4.29+esm115.5.9+dfsg-1ubuntu4.29+esm125.5.9+dfsg-1ubuntu4.29+esm135.5.9+dfsg-1ubuntu4.29+esm145.5.9+dfsg-1ubuntu4.29+esm155.5.9+dfsg-1ubuntu4.29+esm165.5.9+dfsg-1ubuntu4.29+esm175.5.9+dfsg-1ubuntu4.29+esm18
None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2017-7963 is a high vulnerability (CVSS 7.5) in Php, published April 19, 2017. Its validity is disputed. EPSS puts the chance of exploitation in the next 30 days at 2.00%, the 80th percentile.

References

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