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CVE-2020-4207

31
FAUCET Score

CVE-2020-4207 is a critical buffer overflow vulnerability affecting IBM Watson IoT Message Gateway versions 2.0.0.x, 5.0.0.0, 5.0.0.1, and 5.0.0.2. This flaw, caused by improper bounds checking during failed HTTP request handling, allows a remote attacker to execute arbitrary code or cause a denial of service by sending a specially crafted HTTP request. With a CVSS score of 9.8 (Critical), it presents a severe risk due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. Despite its severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0.0.0, < 2.0.0.2CPE matchmatch criteria
cpe:2.3:a:ibm:iot_messagesight:*:*:*:*:*:*:*:*
5.0.0.0CPE matchmatch criteria
cpe:2.3:a:ibm:iot_messagesight:5.0.0.0:*:*:*:*:*:*:*
5.0.0.1CPE matchmatch criteria
cpe:2.3:a:ibm:watson_iot_platform_-_message_gateway:5.0.0.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.53%
Probability of exploitation in next 30 days
EPSS Percentile
90.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0453 is in the 84th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

exchange.xforce.ibmcloud.com / vulnerabilities/174972
VDB EntryVendor Advisory
ibm.com / support/pages/node/1283626
Vendor Advisory