ExploitedIn CISA KEVFix available

CVE-2017-9841

Q: Is CVE-2017-9841 actively exploited?

Yes. CVE-2017-9841 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-08-15.

Q: What is the CVSS score for CVE-2017-9841?

CVE-2017-9841 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exploitation confirmed. First attested on 2022-02-15 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

Published2017-06-27
Fixed in5.6.3 · 4.8.28
WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2017-06-2717:29CVE publishedNVD
2022-02-15Listed as exploited by GCVEGCVE
2022-02-15Exploitation first reportedCISA KEV
2022-02-15Added to the CISA KEV catalogCISA KEV
2025-02-0714:09SSVC exploitation set to activeCISA-ADP
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day7 indicators over 7 days

Indicator	Role	Seen	Source
152.32.130.136	payload delivery	20 h ago	Romain Marcoux - Malicious IPs, Community IOC feed, T145 - Black Mirror IPv4 Blocklist, Bitwire - Inbound Blocklist, AbuseIPDB aggregate - 90-day reported IPv4 (borestad), FFraud - Confirmed abusive IPs, ShadowWhisperer - IPs Threats, ConfigServer - Threat IPs all services 365d, Maltrail Trails (release CSV)
150.40.117.224	payload delivery	20 h ago	Romain Marcoux - Malicious IPs, Community IOC feed, T145 - Black Mirror IPv4 Blocklist, Bitwire - Inbound Blocklist, AbuseIPDB aggregate - 90-day reported IPv4 (borestad), FFraud - Confirmed abusive IPs, ShadowWhisperer - IPs Threats Unclassified, Maltrail Trails (release CSV)
13.140.137.178	payload delivery	20 h ago	Romain Marcoux - Malicious IPs, Community IOC feed, T145 - Black Mirror IPv4 Blocklist, Bitwire - Inbound Blocklist, AbuseIPDB aggregate - 90-day reported IPv4 (borestad), FFraud - Confirmed abusive IPs, Maltrail Trails (release CSV)
84.247.129.208	payload delivery	20 h ago	Romain Marcoux - Malicious IPs, Community IOC feed, T145 - Black Mirror IPv4 Blocklist, Bitwire - Inbound Blocklist, AbuseIPDB aggregate - 90-day reported IPv4 (borestad), FFraud - Confirmed abusive IPs, ConfigServer - Threat IPs all services 365d, ShadowWhisperer - IPs Threats Unclassified, Maltrail Trails (release CSV)
175.200.104.40	payload delivery	20 h ago	Duggytuxy - Blacklist Ips For Fortinet Firewall Aa.txt, Romain Marcoux - Malicious Outgoing IPs, Romain Marcoux - Malicious IPs, IPsum Level 1, Community IOC feed, ThreatHive - Hive Blocklist, T145 - Black Mirror IPv4 Blocklist, Bitwire - Outbound Blocklist, Data-Shield IPv4 Blocklist, Bitwire - Inbound Blocklist, IPsum - Malicious IPs, Borestad - AbuseIPDB Blocklist (30d), AbuseIPDB - IP Blacklist, Borestad - AbuseIPDB Blocklist (1d), AbuseIPDB aggregate - 90-day reported IPv4 (borestad), FFraud - Confirmed abusive IPs, cbuijs - Bad IPs, toxyl - SSH honeypot swarm attacker hosts (3m), ConfigServer - Threat IPs all services 365d, SecureWAN - CTI feed (2+ sources), Maltrail Trails (release CSV), Y3ll0w - CrowdSec CAPI decisions
95.59.142.69	payload delivery	21 h ago	FireHOL - Blocklist Net Ua, FireHOL - Firehol Level4, Romain Marcoux - Malicious IPs, Community IOC feed, ThreatHive - Hive Blocklist, T145 - Black Mirror IPv4 Blocklist, Bitwire - Inbound Blocklist, Borestad - AbuseIPDB Blocklist (30d), Opendbl Net - Blocklistde All.list, Romain Marcoux - Malicious Outgoing IPs, Blocklist - All SSH attacks (48h), Blocklist - All Attacks (48h), IPsum Level 1, Threatview IP Blocklist, Ultimate Hosts Blacklist - Blocklist.de, Malware-Filter - Botnet Filter, Malware-Filter - Botnet Filter IPs, IPsum - Malicious IPs, FireHOL - Blocklist De, FireHOL - Blocklist De Ssh, FireHOL - Firehol Level2, Bitwire - Outbound Blocklist, HaGeZi TIF - Threat Intelligence Feed IPs, CIRCL OSINT Feed, AbuseIPDB aggregate - 90-day reported IPv4 (borestad), blocklist.net.ua - Full Blocklist (CSV), FFraud - Confirmed abusive IPs, cbuijs - Bad IPs, ShadowWhisperer - IPs Threats, toxyl - SSH honeypot swarm attacker hosts (3m), ConfigServer - Threat IPs all services 365d, 0xwarrior - Lab/honeypot malicious IPs, NETMOUNTAINS - Curated IP blocklist, NetAPI - Compromised IPs (current), SecureWAN - CTI feed (2+ sources), Maltrail Trails (release CSV), kamalmjt - Emerging attackers
31.77.156.62	payload delivery	21 h ago	FireHOL - Blocklist Net Ua, FireHOL - Firehol Level4, Romain Marcoux - Malicious IPs, Community IOC feed, T145 - Black Mirror IPv4 Blocklist, Bitwire - Inbound Blocklist, AbuseIPDB aggregate - 90-day reported IPv4 (borestad), blocklist.net.ua - Full Blocklist (CSV), FFraud - Confirmed abusive IPs, cbuijs - Bad IPs, ShadowWhisperer - IPs Threats Unclassified, Maltrail Trails (release CSV)

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-9841?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-9841?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Phpunit project phpunit

Branch	Affected	Fixed in	Source
5.x	≥ 5.0.0, < 5.6.3	5.6.3	NVD
5.x	≥ 5.0.10, < 5.6.3	5.6.3	OSV
4.8	≥ 4.8.19, < 4.8.28	4.8.28	OSV
4.8	≤ 4.8.27	no fix published	NVD

Oracle communications diameter signaling router

Branch	Affected	Fixed in	Source
8.x	≥ 8.0.0, ≤ 8.5.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Phpunit project phpunit to 5.6.3 · 4.8.28
CISA’s required action: Apply updates per vendor instructions.due 2022-08-15

Advisories and patches

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 18 repositories, unverifiedmbrasile/CVE-2017-9841RandomRobbieBF/phpunit-brutecyberharsh/Php-unit-CVE-2017-9841ludy-dev/PHPUnit_eval-stdin_RCEincogbyte/laravel-phpunit-rce-masscaner

CISA Known Exploited Vulnerability

Date Added: 2022-02-15
Patch Due Date: 2022-08-15
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2022-02-15
GCVEexploitation2022-02-15
CISA-ADPSSVC decisionactive2025-02-07
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.19.82025-02-07
NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
CISA-ADPweakness (CWE)CWE-942025-02-07
NVDweakness (CWE)CWE-94read 2026-10-23
FIRST EPSSEPSS score99.9 %read 2026-10-23
PoC-in-GitHubproof of concept18read 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2017-06-27
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2017-9841?

Is CVE-2017-9841 actively exploited?

Yes. CVE-2017-9841 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-08-15.

What is the CVSS score for CVE-2017-9841?

CVE-2017-9841 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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