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Fencer Vulns
high 7.5

CVE-2017-7502 json

Null pointer dereference vulnerability in NSS since 3.24.0 was found when server receives empty SSLv2 messages resulting into denial of ser…

published 2017-05-30 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16519

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.3%
EPSS 4.3% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

Null pointer dereference vulnerability in NSS since 3.24.0 was found when server receives empty SSLv2 messages resulting into denial of service by remote attacker.

Patch / fix

  • nss Debian 14, Debian 13, Debian 12 2:3.26.2-1.1

debian advisories DEBIAN-CVE-2017-7502

  • nss Ubuntu 14.04 LTS 2:3.28.4-0ubuntu0.14.04.2
  • nss Ubuntu 16.04 LTS 2:3.28.4-0ubuntu0.16.04.2

ubuntu advisories UBUNTU-CVE-2017-7502

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nss RHEL 7 3.28.4-1.2.el7_3
  • nss-tools RHEL 7 3.28.4-1.2.el7_3
  • nss-sysinit RHEL 7 3.28.4-1.2.el7_3
  • nss RHEL 6 3.28.4-3.el6_9
  • nss-tools RHEL 6 3.28.4-3.el6_9
  • nss-sysinit RHEL 6 3.28.4-3.el6_9

red hat advisories RHSA-2017:1365RHSA-2017:1364

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-7502 updated cvss 7.5

nss: Null pointer dereference when handling empty SSLv2 messages

  • Red Hat Enterprise Linux 5 nss
    affected: no fix planned “Will not fix”
  • Red Hat Container Development Kit 3.0
    fixed: vendor fix RHSA-2017:1567
  • Red Hat Enterprise Linux Client (v. 7) nss 3.28.4-1.2.el7_3, nss-tools 3.28.4-1.2.el7_3, nss-sysinit 3.28.4-1.2.el7_3 Red Hat Enterprise Linux Client Optional (v. 7) nss-devel 3.28.4-1.2.el7_3, nss-debuginfo 3.28.4-1.2.el7_3, nss-pkcs11-devel 3.28.4-1.2.el7_3 Red Hat Enterprise Linux ComputeNode (v. 7) nss 3.28.4-1.2.el7_3, nss-tools 3.28.4-1.2.el7_3, nss-sysinit 3.28.4-1.2.el7_3 Red Hat Enterprise Linux ComputeNode Optional (v. 7) nss-devel 3.28.4-1.2.el7_3, nss-debuginfo 3.28.4-1.2.el7_3, nss-pkcs11-devel 3.28.4-1.2.el7_3
    fixed: vendor fix RHSA-2017:1365
  • Red Hat Enterprise Linux Desktop (v. 6) nss 3.28.4-3.el6_9, nss-tools 3.28.4-3.el6_9, nss-sysinit 3.28.4-3.el6_9 Red Hat Enterprise Linux Desktop Optional (v. 6) nss-devel 3.28.4-3.el6_9, nss-debuginfo 3.28.4-3.el6_9, nss-pkcs11-devel 3.28.4-3.el6_9 Red Hat Enterprise Linux HPC Node (v. 6) nss 3.28.4-3.el6_9, nss-tools 3.28.4-3.el6_9, nss-sysinit 3.28.4-3.el6_9 Red Hat Enterprise Linux HPC Node Optional (v. 6) nss-devel 3.28.4-3.el6_9, nss-debuginfo 3.28.4-3.el6_9, nss-pkcs11-devel 3.28.4-3.el6_9 Red Hat Enterprise Linux Server (v. 6) nss 3.28.4-3.el6_9, nss-tools 3.28.4-3.el6_9, nss-sysinit 3.28.4-3.el6_9
    fixed: vendor fix RHSA-2017:1364
  • Red Hat Enterprise Linux Server (v. 7) nss 3.28.4-1.2.el7_3, nss-tools 3.28.4-1.2.el7_3, nss-sysinit 3.28.4-1.2.el7_3
    fixed: vendor fix RHSA-2017:1365
  • Red Hat Enterprise Linux Server Optional (v. 6) nss-debuginfo 3.28.4-3.el6_9, nss-pkcs11-devel 3.28.4-3.el6_9
    fixed: vendor fix RHSA-2017:1364
  • Red Hat Enterprise Linux Server Optional (v. 7) nss-debuginfo 3.28.4-1.2.el7_3, nss-pkcs11-devel 3.28.4-1.2.el7_3
    fixed: vendor fix RHSA-2017:1365
  • Red Hat Enterprise Linux Workstation (v. 6) nss 3.28.4-3.el6_9, nss-tools 3.28.4-3.el6_9, nss-sysinit 3.28.4-3.el6_9
    fixed: vendor fix RHSA-2017:1364
show 3 more
  • Red Hat Enterprise Linux Workstation (v. 7) nss 3.28.4-1.2.el7_3, nss-tools 3.28.4-1.2.el7_3, nss-sysinit 3.28.4-1.2.el7_3
    fixed: vendor fix RHSA-2017:1365
  • Red Hat Enterprise Linux Workstation Optional (v. 6) nss-debuginfo 3.28.4-3.el6_9, nss-pkcs11-devel 3.28.4-3.el6_9
    fixed: vendor fix RHSA-2017:1364
  • Red Hat Enterprise Linux Workstation Optional (v. 7) nss-debuginfo 3.28.4-1.2.el7_3, nss-pkcs11-devel 3.28.4-1.2.el7_3
    fixed: vendor fix RHSA-2017:1365

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.30% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • NSS project nss

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.