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CVE-2023-28503

75
FAUCET Score

CVE-2023-28503 is a critical authentication bypass vulnerability affecting Rocket Software UniData versions prior to 8.2.4 build 3003 and UniVerse versions prior to 11.3.5 build 1001 or 12.2.1 build 2002. An unauthenticated attacker can leverage a special username with a deterministic password to bypass authentication and execute OS commands as the root user. With a CVSS score of 9.8, this vulnerability poses a severe risk due to its network-based attack vector, low complexity, and complete compromise of confidentiality, integrity, and availability. While not on the KEV catalog, a Metasploit module exists, and there is community discussion, indicating potential for active exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
<= 8.2.4CPE matchmatch criteria
cpe:2.3:a:rocketsoftware:unidata:*:*:*:*:*:*:*:*
<= 11.3.5CPE matchmatch criteria
cpe:2.3:a:rocketsoftware:universe:*:*:*:*:*:*:*:*
>= 12.0.0, <= 12.2.1CPE matchmatch criteria
cpe:2.3:a:rocketsoftware:universe:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
62.14%
Probability of exploitation in next 30 days
EPSS Percentile
99.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
Metasploit: Rocket Software Unidata udadmin_server Authentication Bypass · Mar 30, 2023
This CVE's current EPSS score of 0.6214 is in the 97th percentile among its peer group of 36,821 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

packetstormsecurity.com / files/171854/Rocket-Software-Unidata-udadmin_server-Authentication-Bypass.html
rapid7.com / blog/post/2023/03/29/multiple-vulnerabilities-in-rocket-software-unirpc-server-fixed
Third Party Advisory