CVE-2023-42821

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• 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

1.25% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 69.2% of scored records. A rank, not a probability.

NVD base score

7.5 (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:H

NVD analysis status

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

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

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

2023-09-22 16:55Z3 YR AGO

Last updated

2024-09-24 19:27Z2 YR AGO

Reserved

2023-09-14

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-125Out-of-bounds ReadBase

Data version

5.1

Document digest

319681118b73520f4fed7f4292ab6007cfa041a8769757e9540a343d472088ee

• github.comhttps://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2x_refsource_CONFIRM
• github.comhttps://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940x_refsource_MISC
• github.comhttps://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69x_refsource_MISC