CVE-2021-23841

Katalog CVE

CVSS 5.9 · Medium EPSS 7,4%

Kerentanan NULL Pointer Dereference pada openssl, debian linux +21 lainnya. Skor CVSS 3.1 5.9 (Medium) menurut NVD.

Deskripsi (NVD)

The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).

Rincian

Terbit di NVD

16 Februari 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

5.9 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-476: NULL Pointer Dereference

EPSS (30 hari)

7,4% peluang dieksploitasi; lebih tinggi dari 94,3% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://www.openssl.org/news/secadv/20210216.txt advisory vendor
• https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf patch · advisory pihak ketiga
• https://www.oracle.com//security-alerts/cpujul2021.html patch · advisory pihak ketiga
• https://www.oracle.com/security-alerts/cpuApr2021.html patch · advisory pihak ketiga
• https://www.oracle.com/security-alerts/cpuapr2022.html patch · advisory pihak ketiga
• https://www.oracle.com/security-alerts/cpuoct2021.html patch · advisory pihak ketiga
• http://seclists.org/fulldisclosure/2021/May/67 mailing list · advisory pihak ketiga
• http://seclists.org/fulldisclosure/2021/May/68 mailing list · advisory pihak ketiga
• http://seclists.org/fulldisclosure/2021/May/70 mailing list · advisory pihak ketiga
• https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846 advisory pihak ketiga
• https://security.gentoo.org/glsa/202103-03 advisory pihak ketiga
• https://security.netapp.com/advisory/ntap-20210219-0009/ advisory pihak ketiga
• https://security.netapp.com/advisory/ntap-20210513-0002/ advisory pihak ketiga
• https://support.apple.com/kb/HT212528 advisory pihak ketiga
• https://support.apple.com/kb/HT212529 advisory pihak ketiga
• https://support.apple.com/kb/HT212534 advisory pihak ketiga
• https://www.debian.org/security/2021/dsa-4855 advisory pihak ketiga
• https://www.tenable.com/security/tns-2021-03 advisory pihak ketiga
• https://www.tenable.com/security/tns-2021-09 advisory pihak ketiga
• https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=122a19ab48091c657f7cb1fb3af9fc07bd557bbf
• https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807
• https://security.netapp.com/advisory/ntap-20240621-0006/