CVE-2017-7523

Exp

Cygwin versions 1.7.2 up to and including 1.8.0 are vulnerable to buffer overflow vulnerability in wcsxfrm/wcsxfrm_l functions resulting into denial-of-service by crashing the process or potential hijack of the process running with administrative privileges triggered by specially crafted input string.

Published: 2017-07-21 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-7523 is rated High Exploit Risk (76.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.75%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.25% 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-2017-7523

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

Exploit prediction scoring system (EPSS) score for CVE-2017-7523

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 0.50% 2.75% +2.25%
2 2026-03-25 0.42% 0.50% +0.08%
3 2025-03-30 — 0.42% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-7523

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 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:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P 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:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2017-7523

Affected software / configurations for CVE-2017-7523

Vendor Product Version Raw CPE
cygwin cygwin 1.7.2 cpe:2.3:a:cygwin:cygwin:1.7.2:*:*:*:*:*:*:*
cygwin cygwin 1.7.3 cpe:2.3:a:cygwin:cygwin:1.7.3:*:*:*:*:*:*:*
cygwin cygwin 1.7.5 cpe:2.3:a:cygwin:cygwin:1.7.5:*:*:*:*:*:*:*
cygwin cygwin 1.7.6 cpe:2.3:a:cygwin:cygwin:1.7.6:*:*:*:*:*:*:*
cygwin cygwin 1.7.7 cpe:2.3:a:cygwin:cygwin:1.7.7:*:*:*:*:*:*:*
cygwin cygwin 1.7.8 cpe:2.3:a:cygwin:cygwin:1.7.8:*:*:*:*:*:*:*
cygwin cygwin 1.7.9 cpe:2.3:a:cygwin:cygwin:1.7.9:*:*:*:*:*:*:*
cygwin cygwin 1.7.10 cpe:2.3:a:cygwin:cygwin:1.7.10:*:*:*:*:*:*:*
cygwin cygwin 1.7.11 cpe:2.3:a:cygwin:cygwin:1.7.11:*:*:*:*:*:*:*
cygwin cygwin 1.7.12 cpe:2.3:a:cygwin:cygwin:1.7.12:*:*:*:*:*:*:*
cygwin cygwin 1.7.13 cpe:2.3:a:cygwin:cygwin:1.7.13:*:*:*:*:*:*:*
cygwin cygwin 1.7.14 cpe:2.3:a:cygwin:cygwin:1.7.14:*:*:*:*:*:*:*
cygwin cygwin 1.7.15 cpe:2.3:a:cygwin:cygwin:1.7.15:*:*:*:*:*:*:*
cygwin cygwin 1.7.16 cpe:2.3:a:cygwin:cygwin:1.7.16:*:*:*:*:*:*:*
cygwin cygwin 1.7.17 cpe:2.3:a:cygwin:cygwin:1.7.17:*:*:*:*:*:*:*
cygwin cygwin 1.7.18 cpe:2.3:a:cygwin:cygwin:1.7.18:*:*:*:*:*:*:*
cygwin cygwin 1.7.19 cpe:2.3:a:cygwin:cygwin:1.7.19:*:*:*:*:*:*:*
cygwin cygwin 1.7.21 cpe:2.3:a:cygwin:cygwin:1.7.21:*:*:*:*:*:*:*
cygwin cygwin 1.7.22 cpe:2.3:a:cygwin:cygwin:1.7.22:*:*:*:*:*:*:*
cygwin cygwin 1.7.23 cpe:2.3:a:cygwin:cygwin:1.7.23:*:*:*:*:*:*:*
cygwin cygwin 1.7.24 cpe:2.3:a:cygwin:cygwin:1.7.24:*:*:*:*:*:*:*
cygwin cygwin 1.7.25 cpe:2.3:a:cygwin:cygwin:1.7.25:*:*:*:*:*:*:*
cygwin cygwin 1.7.26 cpe:2.3:a:cygwin:cygwin:1.7.26:*:*:*:*:*:*:*
cygwin cygwin 1.7.27 cpe:2.3:a:cygwin:cygwin:1.7.27:*:*:*:*:*:*:*
cygwin cygwin 1.7.28 cpe:2.3:a:cygwin:cygwin:1.7.28:*:*:*:*:*:*:*
cygwin cygwin 1.7.29 cpe:2.3:a:cygwin:cygwin:1.7.29:*:*:*:*:*:*:*
cygwin cygwin 1.7.31 cpe:2.3:a:cygwin:cygwin:1.7.31:*:*:*:*:*:*:*
cygwin cygwin 1.7.32 cpe:2.3:a:cygwin:cygwin:1.7.32:*:*:*:*:*:*:*
cygwin cygwin 1.7.33 cpe:2.3:a:cygwin:cygwin:1.7.33:*:*:*:*:*:*:*
cygwin cygwin 1.7.34 cpe:2.3:a:cygwin:cygwin:1.7.34:*:*:*:*:*:*:*
cygwin cygwin 1.7.35 cpe:2.3:a:cygwin:cygwin:1.7.35:*:*:*:*:*:*:*
cygwin cygwin 1.8.0 cpe:2.3:a:cygwin:cygwin:1.8.0:*:*:*:*:*:*:*

References for CVE-2017-7523

URL Tags
https://cygwin.com/ml/cygwin/2017-05/msg00149.html Exploit Mailing List Vendor Advisory
cvelogic Threat Intelligence