CVE-2017-5462

A flaw in DRBG number generation within the Network Security Services (NSS) library where the internal state V does not correctly carry bits over. The NSS library has been updated to fix this issue to address this issue and Firefox ESR 52.1 has been updated with NSS version 3.28.4. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

Published: 2018-06-11 Last update: 2025-11-25 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-5462 is rated Moderate Risk (48.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.07%). Review affected assets and schedule 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-2017-5462

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 2025-11-21 1.18% 1.07% -0.10%
2 2025-11-18 1.11% 1.18% +0.06%
3 2025-03-30 — 1.11% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-5462

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N 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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N 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:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2017-5462

OS Trackers for CVE-2017-5462

vendor priority summary link
debian not yet assigned CVE-2017-5462 not yet assigned priority: Debian including 3 source packages (firefox, firefox-esr, nss), 11 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 11. https://security-tracker.debian.org/tracker/CVE-2017-5462
gentoo high CVE-2017-5462: 2 GLSA(s) (201705-04, 201802-03), 3 atom(s) (dev-libs/nss, www-client/firefox, www-client/firefox-bin); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-5462
redhat medium — https://access.redhat.com/security/cve/CVE-2017-5462
suse medium CVE-2017-5462 severity moderate: SUSE including 161 source package names (MozillaFirefox, MozillaFirefox-102.11.0-150200.152.87.1, …), 539 product×package rows across 86 product lines (Image SLES12-SP5-Azure-BYOS, Image SLES12-SP5-Azure-Basic-On-Demand, … (86 product lines)): Fixed 505, Known Not Affected 34. https://www.suse.com/security/cve/CVE-2017-5462/
ubuntu medium CVE-2017-5462 medium priority: Ubuntu including 3 source packages (firefox, nss, thunderbird), 18 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): released 15, ignored 3. https://ubuntu.com/security/CVE-2017-5462

Affected software / configurations for CVE-2017-5462

Vendor Product Version Raw CPE
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
mozilla firefox < 45.9.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla firefox < 53.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla firefox 52.0 cpe:2.3:a:mozilla:firefox:52.0:*:*:*:*:*:*:*
mozilla network_security_services < 3.28.4 cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
mozilla thunderbird < 52.1.0 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

References for CVE-2017-5462

cvelogic Threat Intelligence