CVE & CISA-KEV Catalog

CVE-2020-25648

HIGHEPSS 89th pctl
7.5
CVSS v3
NVD

Description

A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3. This flaw allows a remote attacker to send multiple CCS messages, causing a denial of service for servers compiled with the NSS library. The highest threat from this vulnerability is to system availability. This flaw affects NSS versions before 3.58.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available
nssDebian
Fixed in:2:3.58-1CVE-2020-25648
Fixed in:2:3.58-1CVE-2020-25648
Fixed in:2:3.58-1CVE-2020-25648
Fixed in:2:3.58-1CVE-2020-25648
libnss3Ubuntu
Fixed in:2:3.35-2ubuntu2.14USN-5410-1
Fixed in:2:3.49.1-1ubuntu1.7USN-5410-1
nssUbuntu
Fixed in:2:3.35-2ubuntu2.14USN-5410-1
Fixed in:2:3.49.1-1ubuntu1.7USN-5410-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

3.90%probability of exploitation in 30 days
89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Vendor Advisory1
Third-Party Advisory2

Related Vulnerabilities

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2023-50387High7.5100%-Fix
CVE-2019-11478Medium5.395%-Fix
CVE-2019-11479High7.592%-Fix
CVE-2024-27316High7.591%-Fix
CVE-2022-30522High7.590%-Fix
CVE-2019-9515High7.587%-Fix

Common questions

How do I fix CVE-2020-25648?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2020-25648 being actively exploited?

Not that we know of. CVE-2020-25648 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 3.9% is the estimated probability that it will be exploited in the next 30 days. That is higher than 89% of all scored CVEs.

How severe is CVE-2020-25648?

CVE-2020-25648 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2020-25648 affect?

Published advisories record a fix for nss (Debian), libnss3 (Ubuntu), nss (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.