CVE-2017-7502

Null pointer dereference vulnerability in NSS since 3.24.0 was found when server receives empty...

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

4.30%Up 1.1 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

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.

Record: CVE-2017-7502
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-476
Updated: 2026-11-02

CVE List No score

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.

Record: CVE-2017-7502
Weakness: CWE-476
Updated: 2026-11-02

EUVDEUVD-2017-16519 No score

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.

Record: EUVD-2017-16519
Updated: 2026-11-03

GitHub AdvisoriesGHSA-97vv-2xv8-266j 7.5

Null pointer dereference vulnerability in NSS since 3.24.0 was found when server receives empty...

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.

Record: GHSA-97vv-2xv8-266j
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

OSVAZL-110498 7.5

CVE-2017-7502 affecting package nss 3.96.1-3

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.

Record: AZL-110498
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSV 7.5

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.

Record: CVE-2017-7502
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Show 6 moreShow less

OSVDEBIAN-CVE-2017-7502 7.5

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.

Record: DEBIAN-CVE-2017-7502
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2017:1364 7.5

Red Hat Security Advisory: nss security and bug fix update

Record: RHSA-2017:1364
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2017:1365 7.5

Red Hat Security Advisory: nss security and bug fix update

Record: RHSA-2017:1365
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2017-7502 7.5

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.

Record: UBUNTU-CVE-2017-7502
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVMGASA-2017-0160 No score

Updated nss packages fix security vulnerability

A null pointer dereference flaw was found in the way NSS handled empty SSLv2 messages. An attacker could use this flaw to crash a server application compiled against the NSS library (CVE-2017-7502).

Record: MGASA-2017-0160
Updated: 2026-11-02

OSVUSN-3336-1 No score

nss vulnerability

It was discovered that NSS incorrectly handled certain empty SSLv2 messages. A remote attacker could possibly use this issue to cause NSS to crash, resulting in a denial of service.

Record: USN-3336-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`nss` Azure Linux:3	through 3.96.1-3	None known
`nss` Debian:12	before 2:3.26.2-1.1	2:3.26.2-1.1
`nss` Debian:13	before 2:3.26.2-1.1	2:3.26.2-1.1
`nss` Debian:14	before 2:3.26.2-1.1	2:3.26.2-1.1
`nss` Debian:7	before 2:3.26-1+debu7u4, plus listed versions 2:3.14.3-12:3.14.4-12:3.14.5-12:3.14.5-1+deb7u12:3.14.5-1+deb7u2 Show 41 moreShow less 2:3.14.5-1+deb7u32:3.14.5-1+deb7u42:3.14.5-1+deb7u52:3.14.5-1+deb7u62:3.14.5-1+deb7u72:3.14.5-1+deb7u82:3.14.5-1~bpo60+12:3.15-12:3.15.1-12:3.15.2-12:3.15.3-12:3.15.3.1-12:3.15.3.1-1.12:3.15.4-12:3.15.4-22:3.16-12:3.16.1-12:3.16.3-12:3.16.3-1.12:3.17-12:3.17-1+x322:3.17.1-12:3.17.2-12:3.17.2-1+x322:3.17.2-1.12:3.17.2-1.1+x322:3.17.4-12:3.18-12:3.19-12:3.19.1-12:3.19.1-22:3.19.2-12:3.19.2-1+x32.12:3.20-12:3.20.1-12:3.21-12:3.21-1.12:3.23-12:3.23-22:3.25-12:3.26-1	2:3.26-1+debu7u4
`nss` Debian:8 From an advisory covering 3 CVEs	before 2:3.26-1+debu8u2, plus listed versions 2:3.17.2-1.12:3.17.2-1.1+deb8u12:3.17.2-1.1+deb8u22:3.17.2-1.1+x322:3.17.4-1 Show 14 moreShow less 2:3.18-12:3.19-12:3.19.1-12:3.19.1-22:3.19.2-12:3.19.2-1+x32.12:3.20-12:3.20.1-12:3.21-12:3.21-1.12:3.23-12:3.23-22:3.25-12:3.26-1	2:3.26-1+debu8u2
`nss` Mageia:5	before 3.28.5-1.mga5	3.28.5-1.mga5
`nss` Red Hat:enterprise_linux:6::client	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-debuginfo` Red Hat:enterprise_linux:6::client	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-sysinit` Red Hat:enterprise_linux:6::client	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9

Show 47 moreShow less

Affected packages
Package	Affected	Fixed
`nss-tools` Red Hat:enterprise_linux:6::client	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-devel` Red Hat:enterprise_linux:6::client	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-pkcs11-devel` Red Hat:enterprise_linux:6::client	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss` Red Hat:enterprise_linux:6::computenode	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-debuginfo` Red Hat:enterprise_linux:6::computenode	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-sysinit` Red Hat:enterprise_linux:6::computenode	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-tools` Red Hat:enterprise_linux:6::computenode	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-devel` Red Hat:enterprise_linux:6::computenode	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-pkcs11-devel` Red Hat:enterprise_linux:6::computenode	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss` Red Hat:enterprise_linux:6::server	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-debuginfo` Red Hat:enterprise_linux:6::server	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-devel` Red Hat:enterprise_linux:6::server	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-sysinit` Red Hat:enterprise_linux:6::server	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-tools` Red Hat:enterprise_linux:6::server	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-pkcs11-devel` Red Hat:enterprise_linux:6::server	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss` Red Hat:enterprise_linux:6::workstation	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-debuginfo` Red Hat:enterprise_linux:6::workstation	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-devel` Red Hat:enterprise_linux:6::workstation	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-sysinit` Red Hat:enterprise_linux:6::workstation	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-tools` Red Hat:enterprise_linux:6::workstation	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss-pkcs11-devel` Red Hat:enterprise_linux:6::workstation	before 0:3.28.4-3.el6_9	0:3.28.4-3.el6_9
`nss` Red Hat:enterprise_linux:7::client	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-debuginfo` Red Hat:enterprise_linux:7::client	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-sysinit` Red Hat:enterprise_linux:7::client	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-tools` Red Hat:enterprise_linux:7::client	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-devel` Red Hat:enterprise_linux:7::client	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-pkcs11-devel` Red Hat:enterprise_linux:7::client	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss` Red Hat:enterprise_linux:7::computenode	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-debuginfo` Red Hat:enterprise_linux:7::computenode	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-sysinit` Red Hat:enterprise_linux:7::computenode	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-tools` Red Hat:enterprise_linux:7::computenode	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-devel` Red Hat:enterprise_linux:7::computenode	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-pkcs11-devel` Red Hat:enterprise_linux:7::computenode	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss` Red Hat:enterprise_linux:7::server	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-debuginfo` Red Hat:enterprise_linux:7::server	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-devel` Red Hat:enterprise_linux:7::server	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-sysinit` Red Hat:enterprise_linux:7::server	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-tools` Red Hat:enterprise_linux:7::server	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-pkcs11-devel` Red Hat:enterprise_linux:7::server	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss` Red Hat:enterprise_linux:7::workstation	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-debuginfo` Red Hat:enterprise_linux:7::workstation	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-devel` Red Hat:enterprise_linux:7::workstation	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-sysinit` Red Hat:enterprise_linux:7::workstation	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-tools` Red Hat:enterprise_linux:7::workstation	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss-pkcs11-devel` Red Hat:enterprise_linux:7::workstation	before 0:3.28.4-1.2.el7_3	0:3.28.4-1.2.el7_3
`nss` Ubuntu:14.04:LTS	before 2:3.28.4-0ubuntu0.14.04.2, plus listed versions 2:3.15.1-1ubuntu12:3.15.2-12:3.15.3-12:3.15.3.1-12:3.15.3.1-1.1 Show 19 moreShow less 2:3.15.3.1-1.1ubuntu12:3.15.4-1ubuntu32:3.15.4-1ubuntu42:3.15.4-1ubuntu52:3.15.4-1ubuntu62:3.15.4-1ubuntu72:3.15.4-1ubuntu7.12:3.17-0ubuntu0.14.04.12:3.17.1-0ubuntu0.14.04.12:3.17.1-0ubuntu0.14.04.22:3.17.4-0ubuntu0.14.04.12:3.19.2-0ubuntu0.14.04.12:3.19.2.1-0ubuntu0.14.04.12:3.19.2.1-0ubuntu0.14.04.22:3.21-0ubuntu0.14.04.12:3.21-0ubuntu0.14.04.22:3.23-0ubuntu0.14.04.12:3.26.2-0ubuntu0.14.04.32:3.28.4-0ubuntu0.14.04.1	2:3.28.4-0ubuntu0.14.04.2
`nss` Ubuntu:16.04:LTS	before 2:3.28.4-0ubuntu0.16.04.2, plus listed versions 2:3.19.2-1ubuntu12:3.19.2.1-0ubuntu12:3.21-1ubuntu22:3.21-1ubuntu32:3.21-1ubuntu42:3.23-0ubuntu0.16.04.12:3.26.2-0ubuntu0.16.04.22:3.28.4-0ubuntu0.16.04.1	2:3.28.4-0ubuntu0.16.04.2

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases, products	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2017-7502 is a high vulnerability (CVSS 7.5) in Mozilla Nss, published May 30, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.30%, the 91st percentile. Fixed in nss 2:3.26.2-1.1.

References

Show 19 moreShow less