CVE•Published 2023-03-17•Modified 2026-07-14•1 article on news•6 live references•NVD data

CVE-2023-28531Openbsd · Openssh

Vulnerability data via NVD (ingested)

CVSS v3.1

9.8

CRITICAL

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

EPSS percentile

Exploit Prediction Scoring System · top 19% of all CVEs

Weaknesses (CWE)

CWE-284Improper Access Control

Description

ssh-add in OpenSSH before 9.3 adds smartcard keys to ssh-agent without the intended per-hop destination constraints. The earliest affected version is 8.9.

Timeline

Published 2023-03-17

Modified 2026-07-14

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag19,264 hosts

vuln:CVE-2023-28531

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Openbsd Openssh"

All exposed Openbsd Openssh instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Openssh"

HTTP body or banner mentions "Openssh" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2023-28531