THREATPORT/VULNERABILITY/CVE-2020-25648
HIGH SEVERITY

CVE-2020-25648

Network Security Services vulnerability

CVSS
7.5
EPSS
3.9%
EPSS pct
89th
Exploited
No known
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.
Affected vendor
Mozilla
Affected product
Network Security Services
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
  • CWE-770 — Allocation of Resources Without Limits or Throttling
Published
2020-10-20

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 3.9% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2020-25648

  • Confirm whether Mozilla Network Security Services is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2020-25648.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-25648

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-25648 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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