CVE-2022-3479: A vulnerability found in nss

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HIGH 7.5REMOTEUPGRADE

CVE-2022-3479 is a high-severity flaw (CVSS 7.5) affecting network security services. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability found in nss. By this security vulnerability, nss client auth crash without a user certificate in the database and this can lead us to a segmentation fault or crash.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Published	2022-10-14
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: mozilla

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-10-14 17:15 UTCPublished CVE record published
2026-06-17 04:59 UTCUpdated Record last modified

mozilla network security services UPGRADE

Affected: >= 3.77 and < 3.87

Fixed in: 3.87

Safe to downgrade to: a release before 3.77

1. Check installed version

apt-cache policy network-security-services || rpm -q network-security-services || network-security-services --version

2. UPGRADE to 3.87 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade network-security-services

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade network-security-services

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.77 (Debian / Ubuntu)

apt-cache madison network-security-services sudo apt install network-security-services=<VERSION_BEFORE_3.77> sudo apt-mark hold network-security-services

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list network-security-services sudo dnf downgrade network-security-services-<VERSION_BEFORE_3.77> sudo dnf versionlock add network-security-services

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-3479?

network security services: upgrade to 3.87. Exact commands for each OS are on this page.

Is CVE-2022-3479 being exploited?

CVE-2022-3479 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-3479 affect?

CVE-2022-3479 affects network security services. Severity is high (CVSS 7.5). A vulnerability found in nss. By this security vulnerability, nss client auth crash without a user certificate in the database and this can lead us to a segmentation fault or crash.

How urgent is CVE-2022-3479?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

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CVE-2020-25648 HIGH 7.5 UPGRADE MITIGATE A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3
CVE-2019-17007 HIGH 7.5 UPGRADE UPGRADE In Network Security Services before 3.44, a malformed Netscape Certificate Sequence can cause NSS to crash, re
CVE-2018-18508 MEDIUM 6.5 UPGRADE UPGRADE In Network Security Services (NSS) before 3.36.7 and before 3.41.1, a malformed signature can cause a crash du
CVE-2018-12404 MEDIUM 5.9 UPGRADE A cached side channel attack during handshakes using RSA encryption could allow for the decryption of encrypte

References

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