CVE-2016-7406

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 10%CVSS: 9.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
65(Track*)
EG Risk 65/100SSVC: Track*

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
Severity98% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
10%
EPSS %ILE
96%
KEV
Not listed

Published

March 3, 2017

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Sep 22, 2026
🔬 Proof of concept available. No patch confirmed yet. Sources: redhat.
redhat

1376353 – (CVE-2016-7406, CVE-2016-7407, CVE-2016-7408, CVE-2016-7409) CVE-2016-7406 CVE-2016-7407 CVE-2016-7408 CVE-2016-7409 dropbear: Multiple issues fixed in dropbear 2016.74

https://bugzilla.redhat.com/show_bug.cgi?id=1376353
generic

CVE-2016-7406 - PSIRT.COM

http://www.securityfocus.com/bid/92974
generic

oss-security - Re: CVE request for Dropbear SSH <2016.74

http://www.openwall.com/lists/oss-security/2016/09/15/2
generic🟡 PoC Available

Full Disclosure: [SYSS-2024-041] DiCal-RED - Use of Unmaintained Third Party Components

http://seclists.org/fulldisclosure/2024/Aug/35
generic

Dropbear: Multiple vulnerabilities (GLSA 201702-23) — Gentoo security

https://security.gentoo.org/glsa/201702-23

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
dropbear—2016.74-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
dropbear—2016.74-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
dropbear—2016.74-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
dropbear—2016.74-1—
Debian:7(1)
PackageVulnerable rangeFixed inDependents
dropbear2012.55-1.32012.55-1.3+deb7u1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 22× 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 147 total refreshes for this CVE.

  1. 2026-09-24 13:59 UTCEPSS rescore
  2. 2026-09-23 13:41 UTCEPSS rescore
  3. 2026-09-20 20:09 UTCEPSS rescore
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  1. 2026-08-18 13:43 UTCEPSS rescore
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  25. 2026-07-23 01:24 UTCEG score recompute
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  48. 2026-07-08 12:45 UTCOSV refresh
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  71. 2026-06-18 17:50 UTCEPSS rescore
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  75. 2026-06-16 17:50 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2016-7406?
CVE-2016-7406 is a critical vulnerability published on March 3, 2017. Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument.
When was CVE-2016-7406 disclosed?
CVE-2016-7406 was first published in the National Vulnerability Database on March 3, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-7406 actively exploited?
CVE-2016-7406 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10% probability of exploitation in the next 30 days, which ranks it in the top 4.4% of all scored CVEs.
What is the CVSS score of CVE-2016-7406?
CVE-2016-7406 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-7406?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-7406, 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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