CVE-2017-16651

Exp

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.

Published: 2017-11-09 Last update: 2026-04-21 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-16651 is rated Critical Active Threat (95.7/100): CVSS High severity, with high exploitation likelihood (EPSS 42.83%, 99th percentile). CISA KEV confirms active exploitation (added 2021-11-03) affecting Roundcube / Roundcube Webmail. a weakness (CWE-552) Unauthenticated remote administrative access may be possible. EPSS rose +6.89% over the last day, indicating growing attacker interest. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2017-16651

Name: Roundcube Webmail File Disclosure Vulnerability · CISA KEV detail

Exploit added: 2021-11-03

Action due: 2022-05-03

Required action: Apply updates per vendor instructions.

Public exploit references (Exploit-DB) for CVE-2017-16651

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-16651

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 35.94% 42.83% +6.89%
2 2026-05-29 39.26% 35.94% -3.32%
3 2026-05-22 — 39.26% —

Full EPSS history (28 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-16651

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
4.6 2.0 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 6.4 [email protected]

Weakness enumeration for CVE-2017-16651

OS Trackers for CVE-2017-16651

vendor priority summary link
debian not yet assigned CVE-2017-16651 not yet assigned priority: Debian including 1 source packages (roundcube), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-16651
ubuntu high CVE-2017-16651 high priority: Ubuntu including 1 source packages (roundcube), 19 status rows across 19 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, trusty, upstream, xenial, zesty): not-affected 14, ignored 2, released 2, DNE 1. https://ubuntu.com/security/CVE-2017-16651

Affected software / configurations for CVE-2017-16651

Vendor Product Version Raw CPE
roundcube webmail <= 1.1.9 cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
roundcube webmail 1.2.0 cpe:2.3:a:roundcube:webmail:1.2.0:*:*:*:*:*:*:*
roundcube webmail 1.2.1 cpe:2.3:a:roundcube:webmail:1.2.1:*:*:*:*:*:*:*
roundcube webmail 1.2.2 cpe:2.3:a:roundcube:webmail:1.2.2:*:*:*:*:*:*:*
roundcube webmail 1.2.3 cpe:2.3:a:roundcube:webmail:1.2.3:*:*:*:*:*:*:*
roundcube webmail 1.2.4 cpe:2.3:a:roundcube:webmail:1.2.4:*:*:*:*:*:*:*
roundcube webmail 1.2.5 cpe:2.3:a:roundcube:webmail:1.2.5:*:*:*:*:*:*:*
roundcube webmail 1.2.6 cpe:2.3:a:roundcube:webmail:1.2.6:*:*:*:*:*:*:*
roundcube webmail 1.3.0 cpe:2.3:a:roundcube:webmail:1.3.0:*:*:*:*:*:*:*
roundcube webmail 1.3.1 cpe:2.3:a:roundcube:webmail:1.3.1:*:*:*:*:*:*:*
roundcube webmail 1.3.2 cpe:2.3:a:roundcube:webmail:1.3.2:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

References for CVE-2017-16651

URL Tags
http://packetstormsecurity.com/files/161226/Roundcube-Webmail-1.2-File-Disclosure.html Exploit Third Party Advisory VDB Entry
http://www.securityfocus.com/bid/101793 Third Party Advisory VDB Entry
https://github.com/roundcube/roundcubemail/issues/6026 Issue Tracking Patch Third Party Advisory
https://github.com/roundcube/roundcubemail/releases/tag/1.1.10 Issue Tracking Release Notes Third Party Advisory
https://github.com/roundcube/roundcubemail/releases/tag/1.2.7 Issue Tracking Release Notes Third Party Advisory
https://github.com/roundcube/roundcubemail/releases/tag/1.3.3 Issue Tracking Release Notes Third Party Advisory
https://lists.debian.org/debian-lts-announce/2017/11/msg00039.html Mailing List Third Party Advisory
https://roundcube.net/news/2017/11/08/security-updates-1.3.3-1.2.7-and-1.1.10 Issue Tracking Vendor Advisory
https://www.debian.org/security/2017/dsa-4030 Issue Tracking Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-16651 US Government Resource
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