NULL pointer dereference in Broadcom Fabric Operating System
CVE-2020-1967
Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).
EPSS: 0.533 (98.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- openssl-security@openssl.org (x_refsource_FREEBSD, vendor-advisory, Patch, Third Party Advisory)
- openssl-security@openssl.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- openssl-security@openssl.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- openssl-security@openssl.org (mailing-list, x_refsource_MLIST)
- openssl-security@openssl.org (mailing-list, x_refsource_MLIST)
- openssl-security@openssl.org (mailing-list, x_refsource_MLIST)
- openssl-security@openssl.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- openssl-security@openssl.org (x_refsource_FEDORA, vendor-advisory)
- openssl-security@openssl.org (x_refsource_FEDORA, vendor-advisory)
- openssl-security@openssl.org (mailing-list, x_refsource_FULLDISC, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-1967?
- CVE-2020-1967 is a high-severity vulnerability in Broadcom Fabric Operating System, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2020-04-21.
- How severe is CVE-2020-1967?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-1967 known to be exploited?
- 32 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.