How severe is CVE-2017-9841?

CVE-2017-9841 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-9841 being actively exploited?

Yes. CVE-2017-9841 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-02-15, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2017-9841?

CVE-2017-9841 primarily affects Phpunit Project Phpunit. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-9841?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

When was CVE-2017-9841 published?

CVE-2017-9841 was published on 2017-06-27 and last updated on 2026-06-17.

CVE-2017-9841

CVE-2017-9841 is a critical-severity vulnerability in Phpunit Project Phpunit with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-02-15). The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 100% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-02-15)
Weakness: CWE-94
Affected product: Phpunit Project Phpunit
Published: 2017-06-27
Last modified: 2026-06-17

Description

Util/PHP/eval-stdin.php in PHPUnit before 4.8.28 and 5.x before 5.6.3 allows remote attackers to execute arbitrary PHP code via HTTP POST data beginning with a "<?php " substring, as demonstrated by an attack on a site with an exposed /vendor folder, i.e., external access to the /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php URI.

Frequently asked questions

What is CVE-2017-9841?: Util/PHP/eval-stdin.php in PHPUnit before 4.8.28 and 5.x before 5.6.3 allows remote attackers to execute arbitrary PHP code via HTTP POST data beginning with a "<?php " substring, as demonstrated by an attack on a site with an exposed /vendor folder, i.e., external access to the /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php URI.
How severe is CVE-2017-9841?: CVE-2017-9841 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-9841 being actively exploited?: Yes. CVE-2017-9841 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-02-15, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2017-9841?: CVE-2017-9841 primarily affects Phpunit Project Phpunit. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-9841?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
When was CVE-2017-9841 published?: CVE-2017-9841 was published on 2017-06-27 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:phpunit_project:phpunit:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_diameter_signaling_router:*:*:*:*:*:*:*:*

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