How severe is CVE-2011-1471?

CVE-2011-1471 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-1471 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1471?

CVE-2011-1471 affects Php. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-1471?

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

When was CVE-2011-1471 published?

CVE-2011-1471 was published on 2011-03-20 and last updated on 2026-06-16.

CVE-2011-1471

CVE-2011-1471 is a medium-severity vulnerability in Php with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-189.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 13% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Php
Published: 2011-03-20
Last modified: 2026-06-16

Description

Integer signedness error in zip_stream.c in the Zip extension in PHP before 5.3.6 allows context-dependent attackers to cause a denial of service (CPU consumption) via a malformed archive file that triggers errors in zip_fread function calls.

Frequently asked questions

What is CVE-2011-1471?: Integer signedness error in zip_stream.c in the Zip extension in PHP before 5.3.6 allows context-dependent attackers to cause a denial of service (CPU consumption) via a malformed archive file that triggers errors in zip_fread function calls.
How severe is CVE-2011-1471?: CVE-2011-1471 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-1471 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1471?: CVE-2011-1471 affects Php. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-1471?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1471 published?: CVE-2011-1471 was published on 2011-03-20 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

221.161.235.168 (ipv4-addr)
103.20.122.54 (ipv4-addr)
82.199.197.245 (ipv4-addr)
58.221.244.34 (ipv4-addr)
222.99.52.202 (ipv4-addr)
220.88.220.59 (ipv4-addr)
211.253.10.61 (ipv4-addr)
121.78.158.30 (ipv4-addr)