CVE-2020-25648
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
02 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
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 3.90% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 89.8% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2020-10-20 00:00Z6 YR AGO
- Last updated
- 2024-08-04 15:40Z2 YR AGO
- Reserved
- 2020-09-16
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-770Allocation of Resources Without Limits or ThrottlingBase
- Data version
- 5.1
- Document digest
- 7f21b70027bc7189d42f482f1cc144c1a0121311cfd3d9ce0d96beb7d149b2ac
05 Affected products
06 References
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1887319
- developer.mozilla.orghttps://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.58_release_notes
- lists.fedoraproject.orgFEDORA-2020-f29254bd5ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RPOLN6DJUYQ3QBQEGLZGV73SNIPK7GHV/
- lists.fedoraproject.orgFEDORA-2020-bb91bf9b8ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HRM53IQCPZT2US3M7JXTP6I6IBA5RGOD/
- lists.fedoraproject.orgFEDORA-2020-a857113c7ahttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ERA5SVJQXQMDGES7RIT4F4NQVLD35RXN/
- lists.apache.org[mina-dev] 20210225 [jira] [Created] (FTPSERVER-500) Security vulnerability in common/lib/log4j-1.2.17.jarhttps://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
- www.oracle.comhttps://www.oracle.com//security-alerts/cpujul2021.html
- www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.html
- www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.html
- lists.debian.org[debian-lts-announce] 20231028 [SECURITY] [DLA 3634-1] nss security updatehttps://lists.debian.org/debian-lts-announce/2023/10/msg00039.html
07 Fixed in
AlmaLinux 8
- nspr Fixed in 4.32.0-1.el8_4
- nspr-devel Fixed in 4.32.0-1.el8_4
- nss Fixed in 3.67.0-6.el8_4
- nss-devel Fixed in 3.67.0-6.el8_4
- nss-softokn Fixed in 3.67.0-6.el8_4
- nss-softokn-devel Fixed in 3.67.0-6.el8_4
- nss-softokn-freebl Fixed in 3.67.0-6.el8_4
- nss-softokn-freebl-devel Fixed in 3.67.0-6.el8_4
- nss-sysinit Fixed in 3.67.0-6.el8_4
- nss-tools Fixed in 3.67.0-6.el8_4
- nss-util Fixed in 3.67.0-6.el8_4
- nss-util-devel Fixed in 3.67.0-6.el8_4
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- nspr Fixed in 4.32.0-1.el8_4
- nspr-devel Fixed in 4.32.0-1.el8_4
- nss Fixed in 3.67.0-6.el8_4
- nss-devel Fixed in 3.67.0-6.el8_4
- nss-softokn Fixed in 3.67.0-6.el8_4
- nss-softokn-devel Fixed in 3.67.0-6.el8_4
- nss-softokn-freebl Fixed in 3.67.0-6.el8_4
- nss-softokn-freebl-devel Fixed in 3.67.0-6.el8_4
- nss-sysinit Fixed in 3.67.0-6.el8_4
- nss-tools Fixed in 3.67.0-6.el8_4
- nss-util Fixed in 3.67.0-6.el8_4
- nss-util-devel Fixed in 3.67.0-6.el8_4
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- nss Fixed in 2:3.58-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- nss Fixed in 2:3.58-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- nss Fixed in 2:3.58-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- nss Fixed in 2:3.35-2ubuntu2.14
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- nss Fixed in 2:3.49.1-1ubuntu1.7
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.