CVE-2017-9841

Q: How do I fix CVE-2017-9841?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Q: Is CVE-2017-9841 being actively exploited?

Yes. CVE-2017-9841 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2022-08-15. Treat it as a priority whatever its CVSS score says.

Q: How severe is CVE-2017-9841?

CVE-2017-9841 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2017-9841 affect?

Published advisories record a fix for phpunit (Debian), phpunit (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-94Code Injection

How to fix

Remediation Available

phpunitDebian

Fixed in:5.4.6-2CVE-2017-9841

phpunitUbuntu

Fixed in:5.1.3-1+ubuntu3+esm1USN-7171-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

100.00%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

PHPUnit Command Injection Vulnerability

PHPUnit 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.

Apply updates per vendor instructions.

Remediation due: 2022-08-15

References

Patch3

Third-Party Advisory2

Other references3

Related Vulnerabilities

Other CWE-94 (Code Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-1635	Critical	9.8	100%	KEV	-
CVE-2025-3248	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-22954	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-22204	Medium	6.8	100%	KEV	Fix
CVE-2012-0158	High	8.8	100%	KEV	-
CVE-2022-22963	Critical	9.8	100%	KEV	-

Common questions

How do I fix CVE-2017-9841?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2017-9841 being actively exploited?

Yes. CVE-2017-9841 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2022-08-15. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2017-9841?

CVE-2017-9841 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2017-9841 affect?

Published advisories record a fix for phpunit (Debian), phpunit (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-21.