CVE-2016-2126

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2022-05-14. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 7%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

Samba version 4.0.0 up to 4.5.2 is vulnerable to privilege elevation due to incorrect handling of the PAC (Privilege Attribute Certificate) checksum. A remote, authenticated, attacker can cause the winbindd process to crash using a legitimate Kerberos ticket. A local service with access to the winbindd privileged pipe can cause winbindd to cache elevated access permissions.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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
Severity65% × 45%
Exploitation7% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
7%
EPSS %ILE
93%
KEV
Not listed

Published

May 11, 2017

Last Modified

June 17, 2026

References (18)

Vendor Advisories for CVE-2016-2126(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuwinbind (2:4.4.5+dfsg-2ubuntu5.2) @ yakkety2026-05-22ubuntu
redhatsamba-0:4.4.4-13.el7_32017-05-22redhat
redhatsamba-0:4.4.6-4.el6rhs2017-03-23redhat
redhatsamba-0:4.4.6-4.el7rhgs2017-03-23redhat
redhatsamba-0:3.6.23-41.el62017-03-21redhat
redhatsamba4-0:4.2.10-9.el62017-03-21redhat

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.

Affected Packages

(8 across 8 ecosystems)
Alpine:v3.2(1)
PackageVulnerable rangeFixed inDependents
samba—4.2.14-r1—
Alpine:v3.3(1)
PackageVulnerable rangeFixed inDependents
samba—4.2.14-r1—
Alpine:v3.4(1)
PackageVulnerable rangeFixed inDependents
samba—4.4.5-r2—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.5.2+dfsg-2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.5.2+dfsg-2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.5.2+dfsg-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.5.2+dfsg-2—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
samba2:4.1.17+dfsg-2 ... 2:4.2.14+dfsg-0+deb8u1 (15 versions)2:4.2.14+dfsg-0+deb8u2—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 5× in last 7d / 25× 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 131 total refreshes for this CVE.

  1. 2026-08-26 14:41 UTCEPSS rescore
  2. 2026-08-25 13:44 UTCEPSS rescore
  3. 2026-08-23 00:13 UTCEPSS rescore
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  24. 2026-07-11 23:22 UTCOSV refresh
  25. 2026-07-11 08:23 UTCEPSS rescore
  26. 2026-07-09 19:05 UTCEPSS rescore
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  74. 2026-06-05 22:44 UTCEPSS rescore
  75. 2026-06-05 06:08 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2016-2126?
CVE-2016-2126 is a medium vulnerability published on May 11, 2017. Samba version 4.0.0 up to 4.5.2 is vulnerable to privilege elevation due to incorrect handling of the PAC (Privilege Attribute Certificate) checksum. A remote, authenticated, attacker can cause the winbindd process to crash using a legitimate Kerberos ticket. A local service with access to the…
When was CVE-2016-2126 disclosed?
CVE-2016-2126 was first published in the National Vulnerability Database on May 11, 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-2016-2126 actively exploited?
CVE-2016-2126 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7% probability of exploitation in the next 30 days, which ranks it in the top 6.7% of all scored CVEs.
What is the CVSS score of CVE-2016-2126?
CVE-2016-2126 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2016-2126?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-2126, 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.

Dependency Blast Radius

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