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CVE-2020-4355

16
FAUCET Score

CVE-2020-4355 is a denial-of-service vulnerability affecting IBM DB2 for Linux, UNIX, and Windows versions 9.7 through 11.5. This flaw stems from improper handling of SSL renegotiation requests, allowing a remote attacker to increase system resource usage. With a CVSS score of 5.3 (Medium), it can be exploited remotely with low attack complexity, requiring no user interaction, and primarily impacts system availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
9.7.0.0CPE matchmatch criteria
cpe:2.3:a:ibm:db2:9.7.0.0:*:*:*:*:*:*:*
10.1.0.0CPE matchmatch criteria
cpe:2.3:a:ibm:db2:10.1.0.0:*:*:*:*:*:*:*
10.5.0.0CPE matchmatch criteria
cpe:2.3:a:ibm:db2:10.5.0.0:*:*:*:*:*:*:*
11.1.0.0CPE matchmatch criteria
cpe:2.3:a:ibm:db2:11.1.0.0:*:*:*:*:*:*:*
11.5.0.0CPE matchmatch criteria
cpe:2.3:a:ibm:db2:11.5.0.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.16%
Probability of exploitation in next 30 days
EPSS Percentile
80.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0216 is in the 70th percentile among its peer group of 23,723 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 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/178507
VDB EntryVendor Advisory
ibm.com / support/pages/node/6242350
PatchVendor Advisory