PatchTheCVECVE-2018-18508: In Network Security Services (NSS) before 3.36.7 and before 3.41.1, a malformed signature can cause a crash du
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MEDIUM 6.5UPGRADEUPGRADEUPGRADE
CVE-2018-18508 is a medium-severity flaw (CVSS 6.5) affecting network security services, ruggedcom rox mx5000 firmware, ruggedcom rox rx1400 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
In Network Security Services (NSS) before 3.36.7 and before 3.41.1, a malformed signature can cause a crash due to a null dereference, resulting in a Denial of Service.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 2.0% (top 20%) |
| CISA exploited list | No |
| Weakness | CWE-476 |
| Published | 2020-10-22 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
mozilla network security services UPGRADE
Affected: < 3.36.7 · >= 3.41 and < 3.41.1
Fixed in: 3.36.7, 3.41.1
Safe to downgrade to: a release before 3.41
1. Check installed version
apt-cache policy network-security-services || rpm -q network-security-services || network-security-services --version
2. UPGRADE to 3.36.7 (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 3.41 (Debian / Ubuntu)
apt-cache madison network-security-services
sudo apt install network-security-services=<VERSION_BEFORE_3.41>
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_3.41>
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.
siemens ruggedcom rox mx5000 firmware UPGRADE
Affected: < 2.14.0
Fixed in: 2.14.0
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
siemens ruggedcom rox rx1400 firmware UPGRADE
Affected: < 2.14.0
Fixed in: 2.14.0
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
siemens ruggedcom rox rx1500 firmware UPGRADE
Affected: < 2.14.0
Fixed in: 2.14.0
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
siemens ruggedcom rox rx1501 firmware UPGRADE
Affected: < 2.14.0
Fixed in: 2.14.0
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
siemens ruggedcom rox rx1510 firmware UPGRADE
Affected: < 2.14.0
Fixed in: 2.14.0
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
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.
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-2018-18508?
network security services: upgrade to 3.36.7, 3.41.1; ruggedcom rox mx5000 firmware: upgrade to 2.14.0; ruggedcom rox rx1400 firmware: upgrade to 2.14.0. Exact commands for each OS are on this page.
Is CVE-2018-18508 being exploited?
CVE-2018-18508 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-2018-18508 affect?
CVE-2018-18508 affects network security services, ruggedcom rox mx5000 firmware, ruggedcom rox rx1400 firmware. Severity is medium (CVSS 6.5). In Network Security Services (NSS) before 3.36.7 and before 3.41.1, a malformed signature can cause a crash due to a null dereference, resulting in a Denial of Service.
How urgent is CVE-2018-18508?
Priority 43/100. No elevated risk signals yet.
Software pages
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