How severe is CVE-2007-0988?

CVE-2007-0988 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2007-0988 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-0988?

CVE-2007-0988 primarily affects Php. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-0988?

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

When was CVE-2007-0988 published?

CVE-2007-0988 was published on 2007-02-20 and last updated on 2026-06-16.

CVE-2007-0988

CVE-2007-0988 is a medium-severity vulnerability in Php with a CVSS 2.0 base score of 4.3. 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-119.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Php
Published: 2007-02-20
Last modified: 2026-06-16

Description

The zend_hash_init function in PHP 5 before 5.2.1 and PHP 4 before 4.4.5, when running on a 64-bit platform, allows context-dependent attackers to cause a denial of service (infinite loop) by unserializing certain integer expressions, which only cause 32-bit arguments to be used after the check for a negative value, as demonstrated by an "a:2147483649:{" argument.

Frequently asked questions

What is CVE-2007-0988?: The zend_hash_init function in PHP 5 before 5.2.1 and PHP 4 before 4.4.5, when running on a 64-bit platform, allows context-dependent attackers to cause a denial of service (infinite loop) by unserializing certain integer expressions, which only cause 32-bit arguments to be used after the check for a negative value, as demonstrated by an "a:2147483649:{" argument.
How severe is CVE-2007-0988?: CVE-2007-0988 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2007-0988 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-0988?: CVE-2007-0988 primarily affects Php. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-0988?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2007-0988 published?: CVE-2007-0988 was published on 2007-02-20 and last updated on 2026-06-16.

References

Affected products (12)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:beta_4_patch1:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:beta1:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:beta2:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:beta3:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:beta4:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:rc2:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:5.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:6.10:*:*:*:*:*:*:*

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CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

90.160.135.217 (ipv4-addr)
62.36.19.42 (ipv4-addr)
62.36.19.41 (ipv4-addr)