ExploitedIn CISA KEVFix available

CVE-2017-16651

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2017-11-09
WeaknessCWE-552

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

Roundcube Webmail before 1.1.10, 1.2.x before 1.2.7, and 1.3.x before 1.3.3 allows unauthorized access to arbitrary files on the host's filesystem, including configuration files, as exploited in the wild in November 2017. The attacker must be able to authenticate at the target system with a valid username/password as the attack requires an active session. The issue is related to file-based attachment plugins and _task=settings&_action=upload-display&_from=timezone requests.

Timeline

dates in UTC

2017-11-0914:29CVE publishedNVD
2021-11-03Listed as exploited by GCVEGCVE
2021-11-03Exploitation first reportedCISA KEV
2021-11-03Added to the CISA KEV catalogCISA KEV
2025-02-0420:56SSVC 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 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-16651?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-16651?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Roundcube webmail

Branch	Affected	Fixed in	Source
1.1	≤ 1.1.9	no fix published	NVD
1.2	= 1.2.0	no fix published	NVD
1.2	= 1.2.1	no fix published	NVD
1.2	= 1.2.2	no fix published	NVD
1.2	= 1.2.3	no fix published	NVD
1.2	= 1.2.4	no fix published	NVD
1.2	= 1.2.5	no fix published	NVD
1.2	= 1.2.6	no fix published	NVD
1.3	= 1.3.0	no fix published	NVD
1.3	= 1.3.1	no fix published	NVD
1.3	= 1.3.2	no fix published	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
7.0	= 7.0	no fix published	NVD
9.0	= 9.0	no fix published	NVD

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

Fix

CISA’s required action: Apply updates per vendor instructions.due 2022-05-03

Advisories and patches

github.comPatch
github.comRelease Notes
github.comRelease Notes
github.comRelease Notes
roundcube.netVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedropbear/CVE-2017-16651

CISA Known Exploited Vulnerability

Date Added: 2021-11-03
Patch Due Date: 2022-05-03
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2021-11-03
GCVEexploitation2021-11-03
CISA-ADPSSVC decisionactive2025-02-04
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.17.82025-02-04
NVDCVSS 3.17.8read 2026-10-23
NVDCVSS 2.04.6read 2026-10-23
CISA-ADPweakness (CWE)CWE-5522025-02-04
NVDweakness (CWE)CWE-552read 2026-10-23
FIRST EPSSEPSS score45.7 %read 2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2017-11-09
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2017-16651?

Is CVE-2017-16651 actively exploited?

Yes. CVE-2017-16651 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 2022-05-03.

What is the CVSS score for CVE-2017-16651?

CVE-2017-16651 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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