CVE-2023-39948

Uncaught fastcdr exception (Unexpected CDR type received) crashing fastdds

7.5 HighFix available

eprosima Fast DDS is a C++ implementation of the Data Distribution Service standard of the Object Management Group. Prior to versions 2.10.0 and 2.6.5, the BadParamException thrown by Fast CDR is not caught in Fast DDS. This can remotely crash any Fast DDS process. Versions 2.10.0 and 2.6.5 contain a patch for this issue.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

1.04%Up 1.0 points since Aug 12, 2023

What each source reports

CVE List Score used 7.5

Uncaught fastcdr exception (Unexpected CDR type received) crashing fastdds

Record: CVE-2023-39948
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-248
Updated: 2026-11-02

EUVDEUVD-2023-43646 7.5

Record: EUVD-2023-43646
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-03

NVD 7.5

Record: CVE-2023-39948
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-248
Updated: 2026-11-02

OSV 7.5

Uncaught fastcdr exception (Unexpected CDR type received) crashing fastdds

Record: CVE-2023-39948
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-248
Updated: 2026-11-02

OSVDEBIAN-CVE-2023-39948 7.5

Record: DEBIAN-CVE-2023-39948
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2023-39948 7.5

Record: UBUNTU-CVE-2023-39948
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUSN-6306-1 No score

fastdds vulnerabilities

It was discovered that Fast DDS incorrectly handled certain inputs. A remote attacker could possibly use this issue to cause a denial of service and information exposure. This issue only affected Ubuntu 22.04 LTS. (CVE-2021-38425)

It was discovered that Fast DDS incorrectly handled certain inputs. An attacker could possibly use this issue to cause a crash. (CVE-2023-39534, CVE-2023-39945, CVE-2023-39946, CVE-2023-39947, CVE-2023-39948, CVE-2023-39949)

Record: USN-6306-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`fastdds` Debian:12	before 2.9.1+ds-1+deb12u1, plus listed versions 2.9.1+ds-1	2.9.1+ds-1+deb12u1
`fastdds` Debian:13	before 2.10.1+ds-2	2.10.1+ds-2
`fastdds` Debian:11 From an advisory covering 6 CVEs	before 2.1.0+ds-9+deb11u1, plus listed versions 2.1.0+ds-9	2.1.0+ds-9+deb11u1
`fastdds` Debian:12 From an advisory covering 6 CVEs	before 2.9.1+ds-1+deb12u1, plus listed versions 2.9.1+ds-1	2.9.1+ds-1+deb12u1
`fastdds` Ubuntu:Pro:22.04:LTS	before 2.5.0+ds-3ubuntu0.1~esm1, plus listed versions 2.1.0+ds-92.4.1+ds-12.5.0+ds-3	2.5.0+ds-3ubuntu0.1~esm1
`fastdds` Ubuntu:Pro:22.04:LTS From an advisory covering 7 CVEs	before 2.5.0+ds-3ubuntu0.1~esm1, plus listed versions 2.1.0+ds-92.4.1+ds-12.5.0+ds-3	2.5.0+ds-3ubuntu0.1~esm1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-39948 is a high vulnerability (CVSS 7.5) in Eprosima Fast Dds, published August 11, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.04%, the 64th percentile. Fixed in fastdds 2.9.1+ds-1+deb12u1.

References

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