How severe is CVE-2025-1734?

CVE-2025-1734 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-1734 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-1734?

CVE-2025-1734 primarily affects Php. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-1734?

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

Does CVE-2025-1734 have an EU (EUVD) identifier?

Yes. CVE-2025-1734 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9429.

When was CVE-2025-1734 published?

CVE-2025-1734 was published on 2025-03-30 and last updated on 2026-06-17.

CVE-2025-1734

CVE-2025-1734 is a medium-severity vulnerability in Php with a CVSS 3.x base score of 5.3. 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-20.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.3
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-9429
Weakness: CWE-20
Affected product: Php
Published: 2025-03-30
Last modified: 2026-06-17

Description

In PHP from 8.1.* before 8.1.32, from 8.2.* before 8.2.28, from 8.3.* before 8.3.19, from 8.4.* before 8.4.5, when receiving headers from HTTP server, the headers missing a colon (:) are treated as valid headers even though they are not. This may confuse applications into accepting invalid headers.

Frequently asked questions

What is CVE-2025-1734?: In PHP from 8.1.* before 8.1.32, from 8.2.* before 8.2.28, from 8.3.* before 8.3.19, from 8.4.* before 8.4.5, when receiving headers from HTTP server, the headers missing a colon (:) are treated as valid headers even though they are not. This may confuse applications into accepting invalid headers.
How severe is CVE-2025-1734?: CVE-2025-1734 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-1734 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-1734?: CVE-2025-1734 primarily affects Php. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-1734?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-1734 have an EU (EUVD) identifier?: Yes. CVE-2025-1734 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9429.
When was CVE-2025-1734 published?: CVE-2025-1734 was published on 2025-03-30 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
cpe:2.3:a:netapp:ontap:9:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

41.205.23.59 (ipv4-addr)
146.190.83.66 (ipv4-addr)
152.89.64.17 (ipv4-addr)
45.177.210.193 (ipv4-addr)
39.164.91.67 (ipv4-addr)
122.3.106.113 (ipv4-addr)
23.95.137.106 (ipv4-addr)