HOMEVULNERABILITIESCVE-2017-9491
MEDIUM

CVE-2017-9491

CWE-200Published: July 31, 2017· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official Description

The Comcast firmware on Cisco DPC3939 (firmware version dpc3939-P20-18-v303r20421733-160420a-CMCST); Cisco DPC3939 (firmware version dpc3939-P20-18-v303r20421746-170221a-CMCST); Cisco DPC3939B (firmware version dpc3939b-v303r204217-150321a-CMCST); Cisco DPC3941T (firmware version DPC3941_2.5s3_PROD_sey); and Arris TG1682G (eMTA&DOCSIS version 10.0.132.SIP.PC20.CT, software version TG1682_2.2p7s2_PROD_sey) devices does not set the secure flag for cookies in an https session to an administration application, which makes it easier for remote attackers to capture these cookies by intercepting their transmission within an http session.

NVD Source

Technical Analysis

CVE-2017-9491 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected Vendors & Products

Cisco6 product(s)
dpc3939 firmwaredpc3939dpc3939b firmwaredpc3939bdpc3941t firmwaredpc3941t
commscope2 product(s)
arris tg1682g firmwarearris tg1682g
Source: NVD CPE · 10 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/BastilleResearch/CableTap/blob/master/doc/advisories/bastille-35.improper-cookie-flags.txt
ADVISORYhttps://github.com/BastilleResearch/CableTap/blob/master/doc/advisories/bastille-35.improper-cookie-flags.txt

All References (2)

→
https://github.com/BastilleResearch/CableTap/blob/master/doc/advisories/bastille-35.improper-cookie-flags.txtMitigation · Third Party Advisory
→
https://github.com/BastilleResearch/CableTap/blob/master/doc/advisories/bastille-35.improper-cookie-flags.txtMitigation · Third Party Advisory

Quick Facts

CVE IDCVE-2017-9491
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-200
CISA KEVNo
Affected2 vendor(s)
PublishedJul 31, 2017

Related CVEs (CWE-200)

CVE-2008-0082
10.0
CVE-2008-3914
10.0
CVE-2011-3497
10.0
CVE-2026-27604
10.0
CVE-2022-29165
10.0
CVE-2008-3010
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2017-9491 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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