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CVE-2017-5461

26
FAUCET Score

CVE-2017-5461 is a critical out-of-bounds write vulnerability affecting multiple versions of Mozilla Network Security Services (NSS) prior to 3.30.1. This flaw allows unauthenticated remote attackers to trigger a denial of service or potentially achieve further unspecified impact through incorrect base64 operations. With a CVSS score of 9.8, it presents a high risk due to its network-based attack vector and lack of user interaction. Despite its severity, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.21.4CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
> 3.22, < 3.28.4CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
>= 3.29, < 3.29.5CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
>= 3.30, < 3.30.1CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.74%
Probability of exploitation in next 30 days
EPSS Percentile
90.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0474 is in the 85th percentile among its peer group of 36,862 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (19)

debianpatch availablevia nvd_reference
View patch
oraclepatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5.9 Long LifeFixed in: nss-0:3.14.3-11.el5_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5 Extended Lifecycle SupportFixed in: nss-0:3.21.4-1.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: nss-0:3.28.4-1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: nss-util-0:3.28.4-1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.2 Advanced Update SupportFixed in: nss-util-0:3.13.1-11.el6_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.4 Advanced Update SupportFixed in: nss-util-0:3.14.3-9.el6_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.5 Advanced Update SupportFixed in: nss-util-0:3.16.1-5.el6_5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.5 Telco Extended Update SupportFixed in: nss-util-0:3.16.1-5.el6_5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.6 Advanced Update SupportFixed in: nss-util-0:3.19.1-4.el6_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.6 Telco Extended Update SupportFixed in: nss-util-0:3.19.1-4.el6_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.7 Extended Update SupportFixed in: nss-util-0:3.21.4-1.el6_7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: nss-0:3.28.4-1.0.el7_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.2 Extended Update SupportFixed in: nss-util-0:3.21.4-1.el7_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: nss-util-0:3.28.4-1.0.el7_3
View patch
redhatpatch availablevia nvd_reference
View patch
mozillavendor investigatingvia nvd_reference
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: nss

Vendor Advisories (1)

redhatCVE-2017-5461Critical

nss: Write beyond bounds caused by bugs in Base64 de/encoding in nssb64d.c and nssb64e.c (MFSA 2017-10)

Apr 19, 2017

References

access.redhat.com / errata/RHSA-2017:1100
Patch
access.redhat.com / errata/RHSA-2017:1101
Patch
access.redhat.com / errata/RHSA-2017:1102
Patch
access.redhat.com / errata/RHSA-2017:1103
Patch
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPermissions Required
developer.mozilla.org / en-US/docs/Mozilla/Projects/NSS/NSS_3.21.4_release_notes
Release NotesVendor Advisory
developer.mozilla.org / en-US/docs/Mozilla/Projects/NSS/NSS_3.28.4_release_notes
Release NotesVendor Advisory
developer.mozilla.org / en-US/docs/Mozilla/Projects/NSS/NSS_3.29.5_release_notes
Release NotesVendor Advisory
developer.mozilla.org / en-US/docs/Mozilla/Projects/NSS/NSS_3.30.1_release_notes
Release NotesVendor Advisory
security.gentoo.org / glsa/201705-04
Third Party Advisory
mozilla.org / en-US/security/advisories/mfsa2017-10
Vendor Advisory
mozilla.org / en-US/security/advisories/mfsa2017-11
Vendor Advisory
mozilla.org / en-US/security/advisories/mfsa2017-12
Vendor Advisory
mozilla.org / en-US/security/advisories/mfsa2017-13
Vendor Advisory
oracle.com / /security-alerts/cpujul2021.html
debian.org / security/2017/dsa-3831
Patch
debian.org / security/2017/dsa-3872
Patch
oracle.com / technetwork/security-advisory/cpujan2018-3236628.html
Patch
oracle.com / technetwork/security-advisory/cpuoct2017-3236626.html
Patch
securityfocus.com / bid/98050
Third Party AdvisoryVDB Entry
securitytracker.com / id/1038320
Third Party AdvisoryVDB Entry