Erlang/OTP 21 lifecycle
Label: Erlang/OTP 21.x
Current status
Erlang/OTP 21 reached end of life on 20 May 2021. Security and bug fixes are no longer provided by the project according to published lifecycle data.
This line is end of life.
Plan your upgrade →Security: 3 tracked advisories affecting this line. Details below — lifecycle and vulnerability status are separate.
Official lifecycle source: Erlang/OTP Security Policy
- Support phase
- end of life
- End of life
- 20 May 2021
- Latest release
- 21.3.8
- Released
- 25 Sept 2020
At a glance
- Version line
- 21
- Initial release
- 25 Sept 2020
- Lifecycle phase
- end of life
- Latest stable
- 21.3.8
- Latest release date
- 25 Sept 2020
- EOL
- 20 May 2021
- Risk
- high
- Releases tracked
- 28
Lifecycle timeline
Phases from published LifecyclePeriod records. Missing phases are not inferred.
Release
25 Sept 2020
standard support
25 Sept 2020 → 20 May 2021
Source: Erlang/OTP Security Policy
end of lifecurrent
20 May 2021 → —
Source: Erlang/OTP Security Policy
Erlang/OTP 21 reached end of life on 20 May 2021. Security and bug fixes are no longer provided by the project according to published lifecycle data.
Upgrade options
Newer supported Erlang/OTP version lines from CompatHub lifecycle data. Compatibility and security context use existing evidence only.
You are on Erlang/OTP 21
End of lifeEOL 20 May 2021
Supported upgrade options
- Erlang/OTP 29Upgrade planner →Supported· 8 major versions newer
- Erlang/OTP 28Upgrade planner →Supported· 7 major versions newer
- Erlang/OTP 27Upgrade planner →Supported· 6 major versions newer
Security
Advisories affecting Erlang/OTP 21 (OSV.dev evidence). Known exploited status, due dates, and ransomware use from CISA KEV when matched.
- Known vulnerabilities
- 3
- Known exploited
- 0
- Highest CVSS
- —
- CVE-2021-29221
- Affected:
- <23.2.3
- Fixed in:
- 23.2.3
- Source:
- OSV source · Advisory
- CVE-2020-35733
- Affected:
- <23.2.2
- Fixed in:
- 23.2.2
- Source:
- OSV source · Advisory
- CVE-2016-1000107
- Affected:
- <=22.1
- Source:
- OSV source · Advisory
Latest release
Previous releases
21.3.7
25 Sept 2020
21.3.6
25 Sept 2020
21.3.5
25 Sept 2020
Release history
28 concrete releases tracked for this line.
Release activity
- Total releases
- 28
- Last 30 days
- 0
- Last 90 days
- 0
- Avg. interval
- ~0 days
- Most recent
- 25 Sept 2020
Should I use this version?
Not recommended for new deployments
Upgrade to a currently supported release line. Recommended target: Erlang/OTP 29.
Version comparison
Compact comparison against the nearest relevant release lines.
Sources
Where this information comes from.
Lifecycle sources
- Erlang/OTP Security Policyfirst party · high confidence
Official source: https://github.com/erlang/otp/blob/master/SECURITY.md
Last verified 2 Sept 2026
- OSV.devfirst party
Official source: https://osv.dev
Verification time not recorded
- NVD (NIST)first party
Official source: https://nvd.nist.gov
Verification time not recorded
- CISA Known Exploited Vulnerabilitiesfirst party
Official source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Verification time not recorded
- RabbitMQ Erlang Compatibilityfirst party
Official source: https://raw.githubusercontent.com/rabbitmq/rabbitmq-website/main/docs/which-erlang.md
Verification time not recorded
Release sources
- Erlang/OTP Security Policyfirst party · high confidence
Official source: https://github.com/erlang/otp/blob/master/SECURITY.md
Last verified 2 Sept 2026
- Erlang/OTP GitHub Releasesfirst party
Official source: https://github.com/erlang/otp/releases
Verification time not recorded
Data coverage
Last checked = last successful upstream check. Latest source update = when upstream content last changed.
- Releases tracked
- 28
- Lifecycle periods
- 2
- EOL
- Known
- Provenance records
- 3
- Data last checked
- 2 Sept 2026
- Latest source update
- 2 Sept 2026