CVE-2018-16793

Exp

Rollup 18 for Microsoft Exchange Server 2010 SP3 and previous versions has an SSRF vulnerability via the username parameter in /owa/auth/logon.aspx in the OWA (Outlook Web Access) login page.

Published: 2018-09-21 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-16793 is rated High Exploit Risk (87.8/100): CVSS High severity, with high exploitation likelihood (EPSS 11.33%, 95th percentile). 3 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +9.02% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2018-16793

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

Exploit prediction scoring system (EPSS) score for CVE-2018-16793

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 2.31% 11.33% +9.02%
2 2026-06-13 2.07% 2.31% +0.24%
3 2026-04-07 — 2.07% —

Full EPSS history (34 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-16793

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.6 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
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:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 4.0 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-16793

Affected software / configurations for CVE-2018-16793

Vendor Product Version Raw CPE
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup1:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup10:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup11:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup12:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup13:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup14:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup15:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup16:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup17:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup18:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup2:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup3:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup4:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup5:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup6:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup7:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup8:*:*:*:*:*:*
microsoft exchange_server 2010 cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup9:*:*:*:*:*:*

References for CVE-2018-16793

URL Tags
http://packetstormsecurity.com/files/149411/Rollup-18-For-Microsoft-Exchange-Server-2010-SP3-Server-Side-Request-Forgery.html Exploit Third Party Advisory VDB Entry
http://seclists.org/fulldisclosure/2018/Sep/20 Exploit Mailing List Third Party Advisory
http://www.securityfocus.com/bid/105386 Third Party Advisory VDB Entry
https://seclists.org/bugtraq/2018/Sep/38 Exploit Issue Tracking Mailing List Third Party Advisory
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