CVE-2017-9139

There is a stack-based buffer overflow on some Tenda routers (FH1202/F1202/F1200: versions before 1.2.0.20). Crafted POST requests to an unspecified URL result in DoS, interrupting the HTTP service (used to login to the web UI of a router) for 1 to 2 seconds.

Published: 2017-05-21 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-9139 is rated Low Risk (24.4/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.37%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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

Exploit prediction scoring system (EPSS) score for CVE-2017-9139

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 0.11% 0.37% +0.26%
2 2025-03-30 0.18% 0.11% -0.07%
3 2025-03-29 — 0.18% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-9139

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.5 3.0 LOW
CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.1 1.4 [email protected]
2.7 2.0 LOW
AV:A/AC:L/Au:S/C:N/I:N/A:P Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 5.1 2.9 [email protected]

Weakness enumeration for CVE-2017-9139

Affected software / configurations for CVE-2017-9139

Vendor Product Version Raw CPE
tendacn f1200_firmware <= 1.2.0.19 cpe:2.3:o:tendacn:f1200_firmware:*:*:*:*:*:*:*:*
tendacn fh1202_firmware <= 1.2.0.19 cpe:2.3:o:tendacn:fh1202_firmware:*:*:*:*:*:*:*:*
tendacn f1202_firmware <= 1.2.0.19 cpe:2.3:o:tendacn:f1202_firmware:*:*:*:*:*:*:*:*

References for CVE-2017-9139

URL Tags
http://www.tendacn.com/en/2017.html Vendor Advisory
cvelogic Threat Intelligence