What’s Vulnerable › Vulnerabilities
CVE-2020-25648
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 3.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-10-20 · updated 2026-06-17
- Weakness: CWE-770
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.
Affected products
- Fedoraproject Fedora: 31, 32, 33
- Mozilla Network Security Services: before 3.58 — fixed in 3.58
- Oracle Communications Offline Mediation Controller: 12.0.0.3.0
- Oracle Corporation Communications Pricing Design Center: 12.0.0.3.0
- Oracle Corporation JD Edwards EnterpriseOne Tools: before 9.2.6.0 — fixed in 9.2.6.0
- Red Hat Enterprise Linux: 7.0, 8.0
How to fix
Upgrade to a fixed version: Mozilla Network Security Services 3.58; Oracle Corporation JD Edwards EnterpriseOne Tools 9.2.6.0. Check the vendor advisory for mitigations.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1887319
- https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.58_release_notes
- https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2023/10/msg00039.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ERA5SVJQXQMDGES7RIT4F4NQVLD35RXN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HRM53IQCPZT2US3M7JXTP6I6IBA5RGOD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RPOLN6DJUYQ3QBQEGLZGV73SNIPK7GHV/
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1887319
- https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.58_release_notes
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