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» CVE-2021-38433
RTI Connext DDS Professional and Connext DDS Secure Versions 4.2x to 6.1.0 vulnerable to a stack-based buffer overflow, which may allow a local attacker to execute arbitrary code.
NVD Status： Modified ，CVE State: published
Threat Intelligence & Risk Assessment for CVE-2021-38433
Conclusion & alert: CVE-2021-38433 is rated Moderate Risk (41.2/100) : CVSS Medium severity, with low exploitation likelihood (EPSS 0.55%).Mandatory action: Review affected assets and schedule remediation.
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-2021-38433
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
0.15%
0.55%
+0.40%
2
2025-05-13
0.19%
0.15%
-0.04%
3
2025-05-12
—
0.19%
—
Full EPSS history
(9 records total)
Common vulnerability scoring system (CVSS) metrics for CVE-2021-38433
CVSS metrics for this CVE.
Base score
Version
Severity
Vector
Exploitability
Impact
Score source
6.6
3.1
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
1.8
4.7
[email protected]
7.8
3.1
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
1.8
5.9
[email protected]
4.6
2.0
MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P
Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
3.9
6.4
[email protected]
Weakness enumeration for CVE-2021-38433
Affected software / configurations for CVE-2021-38433
Vendor
Product
Version
Raw CPE
rti
connext_professional
>= 4.2, < 6.1.0
cpe:2.3:a:rti:connext_professional:*:*:*:*:*:*:*:*
rti
connext_secure
>= 4.2, < 6.1.0
cpe:2.3:a:rti:connext_secure:*:*:*:*:*:*:*:*
References for CVE-2021-38433
cvelogic
Threat Intelligence