Envoy Proxy 1.21 lifecycle
Current status
Envoy Proxy 1.21 reached end of life on 12 Jan 2023. 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: 7 tracked advisories affecting this line · 1 in CISA KEV. Details below — lifecycle and vulnerability status are separate.
Official lifecycle source: Envoy RELEASES.md Policy
- Support phase
- end of life
- End of life
- 12 Jan 2023
- Latest release
- 1.21.6
- Released
- 29 Nov 2022
At a glance
- Version line
- 1.21
- Initial release
- 12 Jan 2022
- Lifecycle phase
- end of life
- Latest stable
- 1.21.6
- Latest release date
- 29 Nov 2022
- EOL
- 12 Jan 2023
- Risk
- high
- Releases tracked
- 7
Lifecycle timeline
Phases from published LifecyclePeriod records. Missing phases are not inferred.
Release
12 Jan 2022
standard support
12 Jan 2022 → 12 Jan 2023
Source: Envoy RELEASES.md Policy
end of lifecurrent
12 Jan 2023 → —
Source: Envoy RELEASES.md Policy
Envoy Proxy 1.21 reached end of life on 12 Jan 2023. Security and bug fixes are no longer provided by the project according to published lifecycle data.
Upgrade options
Newer supported Envoy Proxy version lines from CompatHub lifecycle data. Compatibility and security context use existing evidence only.
You are on Envoy Proxy 1.21
End of lifeEOL 12 January 2023
Supported upgrade options
- Envoy Proxy 1.39Upgrade planner →SupportedEOL 14 July 2027· ~54 months more support· 18 minor versions newer
- Envoy Proxy 1.38Upgrade planner →SupportedEOL 23 April 2027· ~51 months more support· 17 minor versions newer
- Envoy Proxy 1.37Upgrade planner →SupportedEOL 13 January 2027· ~48 months more support· 16 minor versions newer
Known exploited vulnerabilities
CVE entries that CISA lists in the Known Exploited Vulnerabilities catalogue, including due dates and ransomware use when published. CVSS shown when NVD enrichment is available.
- CVE-2023-44487Known exploited
HTTP/2 Rapid Reset Attack Vulnerability
- CISA KEV:
- listed · added 2023-10-10 · due 2023-10-31
- Required action:
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CVSS:
- 7.5 (high) · NVD
- CWE:
- CWE-400
- Affected:
- <3.4.2; <10.5.3; <9.4.0; <1.28.0; <2.7.5; <=2.427; <4.2.2; <1.26.0; <4.1.100; <1.57.0; <2.5.0
- Fixed in:
- 3.4.2, 10.5.3, 9.4.0, 1.28.0, 2.7.5, 4.2.2, 1.26.0, 4.1.100, 1.57.0, 2.5.0
Security
Advisories affecting Envoy Proxy 1.21 (OSV.dev evidence). Known exploited status, due dates, and ransomware use from CISA KEV when matched.
- Known vulnerabilities
- 7
- Known exploited
- 1
- Highest CVSS
- 7.5
- CVE-2023-44487Known exploited
HTTP/2 Rapid Reset Attack Vulnerability
- CISA KEV:
- listed · added 2023-10-10 · due 2023-10-31
- Required action:
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CVSS:
- 7.5 (high) · NVD
- CWE:
- CWE-400
- Affected:
- <3.4.2; <10.5.3; <9.4.0; <1.28.0; <2.7.5; <=2.427; <4.2.2; <1.26.0; <4.1.100; <1.57.0; <2.5.0
- Fixed in:
- 3.4.2, 10.5.3, 9.4.0, 1.28.0, 2.7.5, 4.2.2, 1.26.0, 4.1.100, 1.57.0, 2.5.0
- CVE-2023-35945
Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec
- Affected:
- <1.55.1
- Fixed in:
- 1.55.1
- Source:
- OSV source · Advisory
- CVE-2022-29227
Use after free in Envoy
- Affected:
- <1.22.1
- Fixed in:
- 1.22.1
- Source:
- OSV source · Advisory
- CVE-2022-29226
Trivial authentication bypass in Envoy
- Affected:
- <1.22.1
- Fixed in:
- 1.22.1
- Source:
- OSV source · Advisory
- CVE-2022-29228
Reachable assertion in Envoy
- Affected:
- <1.22.1
- Fixed in:
- 1.22.1
- Source:
- OSV source · Advisory
- CVE-2022-29225
Zip bomb vulnerability in Envoy
- Affected:
- <1.22.1
- Fixed in:
- 1.22.1
- Source:
- OSV source · Advisory
- CVE-2022-29224
Segmentation fault leading to crash in Envoy
- Affected:
- <1.22.1
- Fixed in:
- 1.22.1
- Source:
- OSV source · Advisory
Latest release
Previous releases
1.21.5
27 Jul 2022
1.21.4
15 Jun 2022
1.21.3
9 Jun 2022
Release history
7 concrete releases tracked for this line.
Release activity
- Total releases
- 7
- Last 30 days
- 0
- Last 90 days
- 0
- Avg. interval
- ~53 days
- Most recent
- 29 Nov 2022
Should I use this version?
Not recommended for new deployments
Upgrade to a currently supported release line. Recommended target: Envoy Proxy 1.39.
Version comparison
Compact comparison against the nearest relevant release lines.
Sources
Where this information comes from.
Lifecycle sources
- Envoy RELEASES.md Policyfirst party · high confidence
Official source: https://raw.githubusercontent.com/envoyproxy/envoy/main/RELEASES.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
Release sources
- Envoy RELEASES.md Policyfirst party · high confidence
Official source: https://raw.githubusercontent.com/envoyproxy/envoy/main/RELEASES.md
Last verified 2 Sept 2026
- Envoy GitHub Releasesfirst party
Official source: https://github.com/envoyproxy/envoy/releases
Verification time not recorded
Data coverage
Last checked = last successful upstream check. Latest source update = when upstream content last changed.
- Releases tracked
- 7
- Lifecycle periods
- 2
- EOL
- Known
- Provenance records
- 3
- Data last checked
- 2 Sept 2026
- Latest source update
- 2 Sept 2026