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Vulnerability record · CVE-2020-1968 · published 9 September 2020

CVE-2020-1968: Openssl observable discrepancy vulnerability

OOpenssl · Openssl

The Raccoon attack exploits a flaw in the TLS specification which can lead to an attacker being able to compute the pre-master secret in connections which have used a Diffie-Hellman (DH) based ciphersuite. In such a case this would result in the attacker being able to eavesdrop on all encrypted communications sent over that TLS connection. The attack can only be exploited if an implementation re-uses a DH secret across multiple TLS connections. Note that this issue only impacts DH ciphersuites and not ECDH ciphersuites. This issue affects OpenSSL 1.0.2 which is out of support and no longer receiving public updates. OpenSSL 1.1.1 is not vulnerable to this issue. Fixed in OpenSSL 1.0.2w (Affected 1.0.2-1.0.2v).

3.7 CVSS 3.1 Low EPSS 4.9% · top 8.2% CWE-203 · Observable discrepancy
3.7CVSS 3.1 base score, v2 4.3
4.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
15Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

Description

The Raccoon attack exploits a flaw in the TLS specification which can lead to an attacker being able to compute the pre-master secret in connections which have used a Diffie-Hellman (DH) based ciphersuite. In such a case this would result in the attacker being able to eavesdrop on all encrypted communications sent over that TLS connection. The attack can only be exploited if an implementation re-uses a DH secret across multiple TLS connections. Note that this issue only impacts DH ciphersuites and not ECDH ciphersuites. This issue affects OpenSSL 1.0.2 which is out of support and no longer receiving public updates. OpenSSL 1.1.1 is not vulnerable to this issue. Fixed in OpenSSL 1.0.2w (Affected 1.0.2-1.0.2v).

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

15 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.debian.org/debian-lts-announce/2020/09/msg00016.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202210-02 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200911-0004/ Third Party Advisory
https://usn.ubuntu.com/4504-1/ Third Party Advisory
https://www.openssl.org/news/secadv/20200909.txt Vendor Advisory
https://www.oracle.com//security-alerts/cpujul2021.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.html Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00016.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202210-02 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200911-0004/ Third Party Advisory
https://usn.ubuntu.com/4504-1/ Third Party Advisory
https://www.openssl.org/news/secadv/20200909.txt Vendor Advisory
https://www.oracle.com//security-alerts/cpujul2021.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.html Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-1968), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.