CVE-2017-11462

Double free vulnerability in MIT Kerberos 5 (aka krb5) allows attackers to have unspecified impact via vectors involving automatic deletion of security contexts on error.

Published: 2017-09-13 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-11462 is rated High Risk (65.6/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.05%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-11462

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-01 1.71% 1.05% -0.65%
2 2025-12-10 1.75% 1.71% -0.05%
3 2025-11-18 — 1.75% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-11462

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2017-11462

OS Trackers for CVE-2017-11462

vendor priority summary link
debian low CVE-2017-11462 low priority: Debian including 1 source packages (krb5), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-11462
redhat low — https://access.redhat.com/security/cve/CVE-2017-11462
suse medium CVE-2017-11462 severity moderate: SUSE including 384 source package names (0.9.1:krb5-1.12.5-40.13.1, 1.0.0:krb5-1.12.5-40.13.1, …), 494 product×package rows across 72 product lines (Container caasp/v4/default-http-backend, Container caasp/v4/dnsmasq-nanny, … (72 product lines)): Fixed 312, Known Affected 157, Known Not Affected 25. https://www.suse.com/security/cve/CVE-2017-11462/
ubuntu low CVE-2017-11462 low priority: Ubuntu including 1 source packages (krb5), 12 status rows across 12 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, trusty, upstream, xenial, zesty): not-affected 7, ignored 2, released 2, needs-triage 1. https://ubuntu.com/security/CVE-2017-11462

Affected software / configurations for CVE-2017-11462

Vendor Product Version Raw CPE
mit kerberos_5 1.14 cpe:2.3:a:mit:kerberos_5:1.14:*:*:*:*:*:*:*
mit kerberos_5 1.14 cpe:2.3:a:mit:kerberos_5:1.14:alpha1:*:*:*:*:*:*
mit kerberos_5 1.14 cpe:2.3:a:mit:kerberos_5:1.14:beta1:*:*:*:*:*:*
mit kerberos_5 1.14 cpe:2.3:a:mit:kerberos_5:1.14:beta2:*:*:*:*:*:*
mit kerberos_5 1.14.1 cpe:2.3:a:mit:kerberos_5:1.14.1:*:*:*:*:*:*:*
mit kerberos_5 1.14.2 cpe:2.3:a:mit:kerberos_5:1.14.2:*:*:*:*:*:*:*
mit kerberos_5 1.14.3 cpe:2.3:a:mit:kerberos_5:1.14.3:*:*:*:*:*:*:*
mit kerberos_5 1.14.4 cpe:2.3:a:mit:kerberos_5:1.14.4:*:*:*:*:*:*:*
mit kerberos_5 1.14.5 cpe:2.3:a:mit:kerberos_5:1.14.5:*:*:*:*:*:*:*
mit kerberos_5 1.15 cpe:2.3:a:mit:kerberos_5:1.15:*:*:*:*:*:*:*
mit kerberos_5 1.15.1 cpe:2.3:a:mit:kerberos_5:1.15.1:*:*:*:*:*:*:*
mit kerberos_5 1.15.1 cpe:2.3:a:mit:kerberos_5:1.15.1:beta1:*:*:*:*:*:*
mit kerberos_5 1.15.1 cpe:2.3:a:mit:kerberos_5:1.15.1:beta2:*:*:*:*:*:*
fedoraproject fedora 25 cpe:2.3:o:fedoraproject:fedora:25:*:*:*:*:*:*:*
fedoraproject fedora 26 cpe:2.3:o:fedoraproject:fedora:26:*:*:*:*:*:*:*

References for CVE-2017-11462

cvelogic Threat Intelligence