Issue summary: Processing some specially crafted ASN.1 object identifiers or data containing them may be very slow.
Impact summary: Applications that use OBJ_obj2txt() directly, or use any of the OpenSSL subsystems OCSP, PKCS7/SMIME, CMS, CMP/CRMF or TS with no message size limit may experience notable to very long delays when processing those messages, which may lead to a Denial of Service.
An OBJECT IDENTIFIER is composed of a series of numbers - sub-identifiers - most of which have no size limit. OBJ_obj2txt() may be used to translate an ASN.1 OBJECT IDENTIFIER given in DER encoding form (using the OpenSSL type ASN1_OBJECT) to its canonical numeric text form, which are the sub-identifiers of the OBJECT IDENTIFIER in decimal form, separated by periods.
When one of the sub-identifiers in the OBJECT IDENTIFIER is very large (these are sizes that are seen as absurdly large, taking up tens or hundreds of KiBs), the translation to a decimal number in text may take a very long time. The time complexity is O(n^2) with 'n' being the size of the sub-identifiers in bytes (*).
With OpenSSL 3.0, support to fetch cryptographic algorithms using names / identifiers in string form was introduced. This includes using OBJECT IDENTIFIERs in canonical numeric text form as identifiers for fetching algorithms.
Such OBJECT IDENTIFIERs may be received through the ASN.1 structure AlgorithmIdentifier, which is commonly used in multiple protocols to specify what cryptographic algorithm should be used to sign or verify, encrypt or decrypt, or digest passed data.
Applications that call OBJ_obj2txt() directly with untrusted data are affected, with any version of OpenSSL. If the use is for the mere purpose of display, the severity is considered low.
In OpenSSL 3.0 and newer, this affects the subsystems OCSP, PKCS7/SMIME, CMS, CMP/CRMF or TS. It also impacts anything that processes X.509 certificates, including simple things like verifying its signature.
The impact on TLS is relatively low, because all versions of OpenSSL have a 100KiB limit on the peer's certificate chain. Additionally, this only impacts clients, or servers that have explicitly enabled client authentication.
In OpenSSL 1.1.1 and 1.0.2, this only affects displaying diverse objects, such as X.509 certificates. This is assumed to not happen in such a way that it would cause a Denial of Service, so these versions are considered not affected by this issue in such a way that it would be cause for concern, and the severity is therefore considered low.
CVSS Details
- CVSS 3.1 Base Score: 6.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade openssl-libsUpgrade edk2-tools-docUpgrade edk2-toolsUpgrade opensslUpgrade openssl-perlUpgrade edk2-ovmfUpgrade openssl-develUpgrade edk2-aarch64 | Jun 27, 2023 | May 30, 2023 |
| Alpine Linux | — | Upgrade opensslUpgrade openssl3 | Aug 22, 2024 | May 30, 2023 |
| Amazon Linux Ami 2 | — | Upgrade openssl-perlUpgrade edk2-tools-docUpgrade edk2-toolsUpgrade edk2-aarch64Upgrade openssl-snapsafe-develUpgrade openssl11-develUpgrade openssl-develUpgrade openssl-snapsafeUpgrade openssl-libsUpgrade openssl11-staticUpgrade edk2-ovmfUpgrade openssl11-libsUpgrade openssl-snapsafe-libsUpgrade openssl-snapsafe-debuginfoUpgrade openssl-snapsafe-staticUpgrade opensslUpgrade openssl11Upgrade edk2-tools-pythonUpgrade edk2-debuginfoUpgrade openssl11-debuginfoUpgrade openssl-debuginfoUpgrade openssl-snapsafe-perlUpgrade openssl-static | Jun 8, 2023 | May 30, 2023 |
| Amazon_linux | — | Upgrade openssl | Jun 9, 2023 | May 30, 2023 |
| Amazon_linux_2023 | — | Upgrade opensslUpgrade openssl-libs-debuginfoUpgrade openssl-libsUpgrade openssl-perlUpgrade openssl-debuginfoUpgrade openssl-develUpgrade openssl-debugsource | Feb 17, 2025 | May 30, 2023 |
| Centos_linux | — | Upgrade edk2-ovmfUpgrade openssl-debugsourceUpgrade openssl-perlUpgrade openssl-libsUpgrade openssl-libs-debuginfoUpgrade openssl-debuginfoUpgrade openssl-develUpgrade openssl | Jun 22, 2023 | May 30, 2023 |
| Debian | — | Upgrade openssl | Jun 2, 2023 | May 30, 2023 |
| Dell Poweredge Dsa2024082 | — | Upgrade Dell PowerEdge to the latest version | Oct 23, 2025 | Feb 20, 2024 |
| Dell Powerstore Dsa2023366 | — | Upgrade Dell PowerStoreOS to the latest version | Oct 23, 2025 | Oct 5, 2023 |
| Dell Powerstore Dsa2024120 | — | Upgrade Dell PowerStoreOS to the latest version | Oct 23, 2025 | Mar 26, 2024 |
| Dell Powerstore Dsa2024158 | — | Upgrade Dell PowerStoreOS to the latest version | Jan 13, 2026 | Apr 4, 2024 |
| F5 Big Ip | — | Update F5 BIG-IP to the latest version | Jun 17, 2026 | Jun 22, 2023 |
| Freebsd | — | Upgrade python310Upgrade mysql-connector-odbcUpgrade mysql57-serverUpgrade mysql80-serverUpgrade python38Upgrade mysql-connector-c++Upgrade python37Upgrade openssl31Upgrade python311Upgrade python39Upgrade mysql-connector-jUpgrade openssl-quictlsUpgrade opensslUpgrade openssl30 | Oct 23, 2023 | Oct 23, 2023 |
| Gentoo Linux | — | Upgrade dev-libs/openssl. | Feb 5, 2024 | May 30, 2023 |
| Http Openssl | — | Upgrade to the latest version of OpenSSL | Jun 5, 2024 | May 30, 2023 |
| Huawei Euleros 2_0_sp10 | — | Upgrade shim | Jan 10, 2024 | May 30, 2023 |
| Huawei Euleros 2_0_sp11 | — | Upgrade libsgx-launchUpgrade libsgx-enclave-commonUpgrade libsgx-aesm-launch-pluginUpgrade libsgx-ae-leUpgrade libsgx-urtsUpgrade sgx-aesm-service | Jan 10, 2024 | May 30, 2023 |
| Huawei Euleros 2_0_sp12 | — | Upgrade shim | Jul 1, 2024 | May 30, 2023 |
| Huawei Euleros 2_0_sp8 | — | Upgrade shim-aa64 | Jan 10, 2024 | May 30, 2023 |
| Huawei Euleros 2_0_sp9 | — | Upgrade shimUpgrade shim-aa64-storage | Aug 9, 2023 | May 30, 2023 |
| Ibm Aix | — | Apply the fix or workaround for openssl_advisory39 | Sep 12, 2023 | May 30, 2023 |
| Oracle Mysql | — | Upgrade to MySQL version 5.7.43Upgrade to MySQL version 8.0.34 | Jun 15, 2026 | May 30, 2023 |
| Oracle_linux | — | Upgrade opensslUpgrade openssl-develUpgrade edk2-aarch64Upgrade openssl-libsUpgrade edk2-tools-docUpgrade edk2-ovmfUpgrade edk2-toolsUpgrade openssl-perl | Jun 22, 2023 | May 30, 2023 |
| Rapid7 Insightagent | — | Upgrade Rapid7 Insight Agent to version 4.0.6.14 | Mar 19, 2024 | May 30, 2023 |
| Redhat_linux | — | Upgrade openssl-libsUpgrade edk2-tools-debuginfoNo solution existsUpgrade edk2-toolsUpgrade openssl-debugsourceUpgrade edk2-debugsourceUpgrade openssl-develUpgrade edk2-tools-docUpgrade openssl-debuginfoUpgrade opensslUpgrade edk2-aarch64Upgrade edk2-ovmfUpgrade openssl-perlUpgrade openssl-libs-debuginfo | Jun 22, 2023 | May 30, 2023 |
| Rocky_linux | — | Upgrade openssl-libs-debuginfoUpgrade openssl-fips-provider-debuginfoUpgrade openssl-debugsourceUpgrade openssl-fips-provider-debugsourceUpgrade openssl-perlUpgrade openssl-develUpgrade opensslUpgrade openssl-libsUpgrade openssl-debuginfoUpgrade openssl-fips-provider | Jul 16, 2024 | May 30, 2023 |
| Suse | — | Upgrade libopenssl-3-develUpgrade libopenssl1_0_0-steam-32bitUpgrade libopenssl-1_1-develUpgrade openssl1Upgrade libopenssl1_1-hmac-32bitUpgrade openssl-3-docUpgrade opensslUpgrade openssl-1_1-docUpgrade openssl-1_0_0-cavsUpgrade libopenssl1_0_0-hmacUpgrade libopenssl1-develUpgrade libopenssl10Upgrade libopenssl-1_0_0-develUpgrade libopenssl1_1-hmacUpgrade openssl-3Upgrade libopenssl1_0_0-32bitUpgrade libopenssl1_1-32bitUpgrade libopenssl0_9_8-32bitUpgrade libopenssl1_0_0Upgrade libopenssl-3-devel-32bitUpgrade openssl-docUpgrade libopenssl1_0_0-steamUpgrade libopenssl0_9_8-hmac-32bitUpgrade libopenssl0_9_8-hmacUpgrade libopenssl-develUpgrade libopenssl1_0_0-hmac-32bitUpgrade openssl1-docUpgrade libopenssl-1_0_0-devel-32bitUpgrade libopenssl1_1Upgrade libopenssl-1_1-devel-32bitUpgrade openssl-1_0_0Upgrade libopenssl3-32bitUpgrade openssl-1_0_0-docUpgrade libopenssl0_9_8Upgrade libopenssl3Upgrade openssl-1_1 | May 31, 2023 | May 30, 2023 |
| Ubuntu | — | Upgrade qemu-efi-riscv64Upgrade libssl1.0.0Upgrade qemu-efi-loongarch64Upgrade ovmfUpgrade libssl1.0.0 (Ubuntu Pro)Upgrade nodejsUpgrade ovmf-ia32Upgrade libssl3Upgrade qemu-efi-aarch64Upgrade qemu-efi-armUpgrade openssl (Ubuntu Pro)Upgrade libssl1.1Upgrade qemu-efiUpgrade libnode72 | May 31, 2023 | May 30, 2023 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | May 30, 2023 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub