CVE-2023-28756

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

2.45% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 83.0% of scored records. A rank, not a probability.

NVD base score

5.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2023-03-31 00:00Z3 YR AGO

Last updated

2025-11-04 16:10Z10 MO AGO

Reserved

2023-03-23

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-1333Inefficient Regular Expression ComplexityBase
• CWE-20Improper Input ValidationClass

Data version

5.2

Document digest

ecc5f0b6c3b4be29e639bbc3f428319e2fa54bc256329c60b381059c526e456c

• www.ruby-lang.orghttps://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released/
• www.ruby-lang.orghttps://www.ruby-lang.org/en/downloads/releases/
• github.comhttps://github.com/ruby/time/releases/
• www.ruby-lang.orghttps://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756/
• lists.fedoraproject.orgFEDORA-2023-6b924d3b75https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA/vendor-advisory
• lists.fedoraproject.orgFEDORA-2023-a7be7ea1aahttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z/vendor-advisory
• lists.fedoraproject.orgFEDORA-2023-f58d72c700https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T/vendor-advisory
• lists.debian.org[debian-lts-announce] 20230430 [SECURITY] [DLA 3408-1] jruby security updatehttps://lists.debian.org/debian-lts-announce/2023/04/msg00033.htmlmailing-list
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20230526-0004/
• security.gentoo.orgGLSA-202401-27https://security.gentoo.org/glsa/202401-27vendor-advisory
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/09/msg00000.html