Description
Issue summary: Some non-default TLS server configurations can cause unbounded
memory growth when processing TLSv1.3 sessions
Impact summary: An attacker may exploit certain server configurations to trigger
unbounded memory growth that would lead to a Denial of Service
This problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is
being used (but not if early_data support is also configured and the default
anti-replay protection is in use). In this case, under certain conditions, the
session cache can get into an incorrect state and it will fail to flush properly
as it fills. The session cache will continue to grow in an unbounded manner. A
malicious client could deliberately create the scenario for this failure to
force a Denial of Service. It may also happen by accident in normal operation.
This issue only affects TLS servers supporting TLSv1.3. It does not affect TLS
clients.
The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL
1.0.2 is also not affected by this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenSSL | OpenSSL | 3.2.0 – < 3.2.2, 3.1.0 – < 3.1.6, 3.0.0 – < 3.0.14, 1.1.1 – < 1.1.1y | 3.2.2 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openssl | 3.2.2-1 | — |
| Debian 13 | openssl | 3.2.2-1 | — |
| Debian 12 | openssl | 3.0.14-1~deb12u1 | — |
| Debian 11 | openssl | 1.1.1n-0+deb11u6 | DLA-3942-2, DLA-3942-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | edk2 | 2024.02-2ubuntu0.6 | USN-7894-1 |
| Ubuntu 24.04 LTS | openssl | 3.0.13-0ubuntu3.2 | USN-6937-1 |
| Ubuntu 22.04 LTS | edk2 | 2022.02-3ubuntu0.22.04.4 | USN-7894-1 |
| Ubuntu 22.04 LTS | openssl | 3.0.2-0ubuntu1.17 | USN-6937-1 |
| Ubuntu 20.04 LTS | openssl | 1.1.1f-1ubuntu2.23 | USN-6937-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 20.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | openssl-fips | 3.0.13-0ubuntu3.6+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl | 3.0.2-0ubuntu1.17+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | openssl +1 | No fix yet | — |
| Ubuntu Pro 22.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 20.04 LTS | edk2 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | openssl | 1.1.1f-1ubuntu2.24+esm5 | USN-8678-2 |
| Ubuntu Pro 18.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | openssl | 1.1.1-1ubuntu2.1~18.04.23+esm10 | USN-8678-2 |
| Ubuntu Pro 18.04 LTS | openssl1.0 | 1.0.2n-1ubuntu5.13+esm6 | USN-8678-2 |
| Ubuntu Pro 16.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | openssl | 1.0.2g-1ubuntu4.20+esm18 | USN-8678-2 |
| Ubuntu Pro 14.04 LTS | openssl | 1.0.1f-1ubuntu2.27+esm16 | USN-8678-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | openssl +3 | 1:3.2.2-6.el9_5 | RHSA-2024:9333 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | openssl +3 | 1:3.2.2-6.el9_5 | ALSA-2024:9333 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | openssl | 1:3.2.2-6.el9_5.1 | RLSA-2024:9333 |
| Rocky Linux 9 | openssl-fips-provider | 3.0.7-6.el9_5 | RLSA-2024:9333 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.28.2 | SUSE-SU-2024:1808-1 |
| SLES 15 SP5 | openssl-3 | 3.0.8-150500.5.30.1 | SUSE-SU-2024:1634-1 |
| SLES 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.66.2 | SUSE-SU-2024:1949-1 |
| SLES 15 SP4 | openssl-3 | 3.0.8-150400.4.54.1 | SUSE-SU-2024:1947-1 |
| SLES 15 SP3 | openssl-1_1 | 1.1.1d-150200.11.88.1 | SUSE-SU-2024:1633-1 |
| SLES 15 SP2 | openssl-1_1 | 1.1.1d-150200.11.88.1 | SUSE-SU-2024:1633-1 |
| SLES 12 SP5 | openssl-1_1 | 1.1.1d-2.110.2 | SUSE-SU-2024:2953-1 |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.66.2 | SUSE-SU-2024:1949-1 |
| SLES for SAP 15 SP4 | openssl-3 | 3.0.8-150400.4.54.1 | SUSE-SU-2024:1947-1 |
| SLES for SAP 15 SP3 | openssl-1_1 | 1.1.1d-150200.11.88.1 | SUSE-SU-2024:1633-1 |
| SLES for SAP 15 SP2 | openssl-1_1 | 1.1.1d-150200.11.88.1 | SUSE-SU-2024:1633-1 |
| SLES for SAP 12 SP5 | openssl-1_1 | 1.1.1d-2.110.2 | SUSE-SU-2024:2953-1 |
| SLE Micro 6.0 | jitterentropy | 3.4.1-3.1 | SUSE-SU-2025:20014-1 |
| SLE Micro 6.0 | libpulp | 0.3.5-1.1 | SUSE-SU-2025:20014-1 |
| SLE Micro 6.0 | openssl-3 | 3.1.4-6.1 | SUSE-SU-2025:20014-1 |
| SLE Micro 5.5 | openssl-1_1 | 1.1.1l-150500.17.28.2 | SUSE-SU-2024:1808-1 |
| SLE Micro 5.4 | openssl-1_1 | 1.1.1l-150400.7.66.2 | SUSE-SU-2024:1949-1 |
| SLE Micro 5.4 | openssl-3 | 3.0.8-150400.4.54.1 | SUSE-SU-2024:1947-1 |
| SLE Micro 5.3 | openssl-1_1 | 1.1.1l-150400.7.66.2 | SUSE-SU-2024:1949-1 |
| SLE Micro 5.3 | openssl-3 | 3.0.8-150400.4.54.1 | SUSE-SU-2024:1947-1 |
| SLE Micro 5.2 | openssl-1_1 | 1.1.1d-150200.11.88.1 | SUSE-SU-2024:1633-1 |
| SLE Micro 5.1 | openssl-1_1 | 1.1.1d-150200.11.88.1 | SUSE-SU-2024:1633-1 |
| SLE HPC 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.66.2 | SUSE-SU-2024:1949-1 |
| SLE HPC 15 SP4 | openssl-3 | 3.0.8-150400.4.54.1 | SUSE-SU-2024:1947-1 |
| SLE HPC 15 SP3 | openssl-1_1 | 1.1.1d-150200.11.88.1 | SUSE-SU-2024:1633-1 |
| SLE HPC 15 SP2 | openssl-1_1 | 1.1.1d-150200.11.88.1 | SUSE-SU-2024:1633-1 |
| SUSE Manager Server 4.3 | openssl-1_1 | 1.1.1l-150400.7.66.2 | SUSE-SU-2024:1949-1 |
| SUSE Manager Server 4.3 | openssl-3 | 3.0.8-150400.4.54.1 | SUSE-SU-2024:1947-1 |
| SUSE Manager Proxy 4.3 | openssl-1_1 | 1.1.1l-150400.7.66.2 | SUSE-SU-2024:1949-1 |
| SUSE Manager Proxy 4.3 | openssl-3 | 3.0.8-150400.4.54.1 | SUSE-SU-2024:1947-1 |
| SUSE Enterprise Storage 7.1 | openssl-1_1 | 1.1.1d-150200.11.88.1 | SUSE-SU-2024:1633-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openssl-1_1 | 1.1.1w-9.1 | openSUSE-SU-2024:13937-1 |
| openSUSE Tumbleweed | openssl-3 | 3.1.4-6.1 | openSUSE-SU-2024:13942-1 |
| openSUSE Leap 15.5 | openssl-1_1 | 1.1.1l-150500.17.28.2 | SUSE-SU-2024:1808-1 |
| openSUSE Leap 15.5 | openssl-3 | 3.0.8-150500.5.30.1 | SUSE-SU-2024:1634-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.4 | openssl-1_1 | 1.1.1l-150400.7.66.2 | SUSE-SU-2024:1949-1 |
| openSUSE Leap Micro 5.4 | openssl-3 | 3.0.8-150400.4.54.1 | SUSE-SU-2024:1947-1 |
| openSUSE Leap Micro 5.3 | openssl-1_1 | 1.1.1l-150400.7.66.2 | SUSE-SU-2024:1949-1 |
| openSUSE Leap Micro 5.3 | openssl-3 | 3.0.8-150400.4.54.1 | SUSE-SU-2024:1947-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openssl | 3.2.1-r2 | — |
| Alpine v3.23 | openssl | 3.2.1-r2 | — |
| Alpine v3.22 | openssl | 3.2.1-r2 | — |
| Alpine v3.21 | openssl | 3.2.1-r2 | — |
| Alpine v3.20 | openssl | 3.2.1-r2 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | openssl | 3.1.4-r6 | — |
| Alpine v3.18 | openssl | 3.1.4-r6 | — |
| Alpine v3.17 | openssl | 3.0.12-r5 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | openssl +4 | 1:3.0.8-1.amzn2023.0.12 | ALAS2023-2024-640 |
| Amazon Linux 2 | edk2-ovmf +4 | 20200801stable-1.amzn2.0.6 | ALAS2-2024-2539 |
| Amazon Linux 2 | openssl11 +3 | 1:1.1.1g-12.amzn2.0.21 | ALAS2-2024-2564 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | cloud-hypervisor-cvm | 38.0.72.2-1 | — |
| Azure Linux 3 | edk2 | 20240524git3e722403cd16-8 | — |
| Azure Linux 3 | nodejs | 20.14.0-1 | — |
| Azure Linux 3 | openssl | 3.3.0-1 | — |
| Azure Linux 3 | openssl-fips-provider | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | cloud-hypervisor-cvm | 38.0.72.2-1 | — |
| Azure Linux 2 (CBL-Mariner) | hvloader | 1.0.1-6 | — |
| Azure Linux 2 (CBL-Mariner) | openssl | 1.1.1k-30 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | openssl +3 | 1:3.2.2-6.0.1.el9_5 | ELSA-2024-9333 |
| Oracle Linux 9 | openssl-fips-provider +1 | 3.0.7-6.0.1.el9_5 | ELSA-2024-9333 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | openssl | 3.3.0-r5 | — |
Advisories 50
- USN-7894-1 edk2 vulnerabilities Ubuntu Security Notices (USN) · Nov 9, 2026
- USN-6937-1 openssl vulnerabilities Ubuntu Security Notices (USN) · Nov 9, 2026
- ALSA-2024:9333 Low: openssl security update AlmaLinux Security Advisories · Oct 29, 2026
- SSA-265688 SSA-265688: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP V1.1 Siemens ProductCERT · Oct 13, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- RHSA-2024:9333 Red Hat Security Advisory: openssl and openssl-fips-provider security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- WID-SEC-2024-0813 OpenSSL: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Aug 31, 2026
- USN-8678-2 openssl, openssl1.0 vulnerabilities Ubuntu Security Notices (USN) · Aug 27, 2026
- WID-SEC-2025-0647 Splunk Splunk Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 9, 2026
- ICSA-24-102-01 Siemens SIMATIC S7-1500 TM MFP CISA ICS & IT advisories · May 14, 2026
- SUSE-SU-2025:20014-1 Security update for openssl-3, libpulp, ulp-macros SUSE / openSUSE Security Updates · Mar 23, 2026
- DLA-3942-1 openssl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3942-2 openssl - regression update Debian Security (DSA / DLA) · Mar 9, 2026
- ICSA-25-226-15 Siemens SINEC OS CISA ICS & IT advisories · Feb 25, 2026
- SSA-613116 SSA-613116: Multiple Vulnerabilities in Third-Party Components in SINEC OS before V3.1 Siemens ProductCERT · Feb 24, 2026
- VDE-2025-109 Phoenix Contact: Unbounded growth of the session cache in TCP encapsulation service in FL MGUARD 2xxx and 4xxx firmware CERT@VDE · Feb 23, 2026
- RLSA-2024:9333 Low: openssl and openssl-fips-provider security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2024:1634-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13942-1 libopenssl-3-devel-3.1.4-6.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13937-1 libopenssl-1_1-devel-1.1.1w-9.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1808-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1949-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2953-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1633-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1947-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-3191 Oracle Fusion Middleware: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 11, 2026
- WID-SEC-2025-0225 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 1, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- WID-SEC-2024-2112 Insyde UEFI Firmware: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Aug 4, 2025
- VDE-2024-071 Phoenix Contact: Multiple Vulnerabilities in PLCnext Firmware CERT@VDE · May 22, 2025
- ICSA-25-044-09 Siemens SCALANCE W700 IEEE 802.11ax CISA ICS & IT advisories · May 6, 2025
- ICSA-24-319-06 Siemens SCALANCE M-800 Family CISA ICS & IT advisories · May 6, 2025
- NCSC-2025-0061 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Feb 14, 2025
- NCSC-2025-0051 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Feb 11, 2025
- SSA-769027 SSA-769027: Multiple Vulnerabilities fixed in SCALANCE W700 IEEE 802.11ax devices before V3.0.0 Siemens ProductCERT · Feb 11, 2025
- NCSC-2025-0023 Kwetsbaarheden verholpen in Oracle PeopleSoft NCSC-NL (Netherlands) · Jan 22, 2025
- ELSA-2024-9333 Low: openssl and openssl-fips-provider security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 14, 2024
- NCSC-2024-0433 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Nov 12, 2024
- SSA-915275 SSA-915275: Multiple Vulnerabilities in SINEC INS Before V1.0 SP2 Update 3 Siemens ProductCERT · Nov 12, 2024
- ICSA-24-319-08 Siemens SINEC INS CISA ICS & IT advisories · Nov 12, 2024
- SSA-354112 SSA-354112: Multiple Vulnerabilities in SCALANCE M-800 Family Before V8.2 Siemens ProductCERT · Nov 12, 2024
- NCSC-2024-0417 Kwetsbaarheden verholpen in Oracle Fusion Middleware NCSC-NL (Netherlands) · Oct 17, 2024
- NCSC-2024-0416 Kwetsbaarheden verholpen in Oracle Financial Services Applications NCSC-NL (Netherlands) · Oct 17, 2024
- NCSC-2024-0411 Kwetsbaarheden verholpen in Oracle Database producten NCSC-NL (Netherlands) · Oct 17, 2024
- WID-SEC-2024-3192 Oracle Financial Services Applications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 15, 2024
- NCSC-2024-0297 Kwetsbaarheden verholpen in Oracle Financial Services Applications NCSC-NL (Netherlands) · Jul 17, 2024
- WID-SEC-2024-1638 Oracle Financial Services Applications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 16, 2024
- ALAS2-2024-2564 Moderate: openssl11 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 12, 2024
- VDE-2024-029 Phoenix Contact: Unbounded growth of OpenSSL session cache in multiple FL MGUARD devices CERT@VDE · Jun 11, 2024
- ALAS2023-2024-640 Moderate: openssl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 10, 2024
References
- OpenSSL Advisory vendor-advisory
- 3.2.2 git commit patch
- 3.1.6 git commit patch
- 3.0.14 git commit patch
- 1.1.1y git commit patch