CVE-2023-1523

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2023-09-01. NVD baseline CVSS 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
10.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 10.0Exploit: NoneExposed: 0

A fix is available — apply it.

Using the TIOCLINUX ioctl request, a malicious snap could inject contents into the input of the controlling terminal which could allow it to cause arbitrary commands to be executed outside of the snap sandbox after the snap exits. Graphical terminal emulators like xterm, gnome-terminal and others are not affected - this can only be exploited when snaps are run on a virtual console.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
76(Attend)
EG Risk 76/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
70.6%
KEV
Not listed

Published

September 1, 2023

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Jul 18, 2026
Patch available. Sources: github_pr, ubuntu.
ubuntu Patch Available

USN-6125-1: snapd vulnerability | Ubuntu security notices | Ubuntu

https://ubuntu.com/security/notices/USN-6125-1
generic

'Re: [oss-security] TTY pushback vulnerabilities / TIOCSTI' - MARC

https://marc.info/?l=oss-security&m=167879021709955&w=2
github_pr Patch Available

many: introduce seccomp denylist to block ioctl with TIOCLINUX to fix CVE-2023-1523

Patch available: snapcore/snapd 2.60.3 (PR #12849 merged 2023-05-26)

https://github.com/snapcore/snapd/pull/12849
generic
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1523

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuubuntu-snappy (2.58+20.04.1) @ focal2026-05-24ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 13× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 106 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2023-1523?
CVE-2023-1523 is a critical vulnerability published on September 1, 2023. Using the TIOCLINUX ioctl request, a malicious snap could inject contents into the input of the controlling terminal which could allow it to cause arbitrary commands to be executed outside of the snap sandbox after the snap exits. Graphical terminal emulators like xterm, gnome-terminal and others…
When was CVE-2023-1523 disclosed?
CVE-2023-1523 was first published in the National Vulnerability Database on September 1, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-1523 actively exploited?
CVE-2023-1523 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 70.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-1523?
CVE-2023-1523 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2023-1523?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-1523, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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