HOMEVULNERABILITIESCVE-2020-6994
CRITICAL

CVE-2020-6994

CWE-12Published: April 3, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

A buffer overflow vulnerability was found in some devices of Hirschmann Automation and Control HiOS and HiSecOS. The vulnerability is due to improper parsing of URL arguments. An attacker could exploit this vulnerability by specially crafting HTTP requests to overflow an internal buffer. The following devices using HiOS Version 07.0.02 and lower are affected: RSP, RSPE, RSPS, RSPL, MSP, EES, EES, EESX, GRS, OS, RED. The following devices using HiSecOS Version 03.2.00 and lower are affected: EAGLE20/30.

NVD Source

Technical Analysis

CVE-2020-6994 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.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

belden14 product(s)
hirschmann hioshirschmann embedded ethernet switchhirschmann embedded ethernet switch extendedhirschmann greyhound swtichhirschmann mice switch powerhirschmann octopushirschmann prp redboxhirschmann rail switch powerhirschmann rail switch power enhancedhirschmann rail switch power litehirschmann rail switch power smarthirschmann hisecos+2
Source: NVD CPE · 14 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
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Official Patches & Advisories

ADVISORYhttps://www.us-cert.gov/ics/advisories/icsa-20-091-01
ADVISORYhttps://www.us-cert.gov/ics/advisories/icsa-20-091-01

All References (2)

→
https://www.us-cert.gov/ics/advisories/icsa-20-091-01Mitigation · Third Party Advisory · US Government Resource
→
https://www.us-cert.gov/ics/advisories/icsa-20-091-01Mitigation · Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2020-6994
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-12
CISA KEVNo
Affected1 vendor(s)
PublishedApr 3, 2020

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-6994 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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