CVE-2020-1968 | Raccoon attack

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).

Published: 2020-09-09 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-1968 is rated Moderate Risk (50.3/100): CVSS Low severity, with high exploitation likelihood (EPSS 4.78%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +3.74% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-1968

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.04% 4.78% +3.74%
2 2026-04-14 1.31% 1.04% -0.27%
3 2026-03-22 — 1.31% —

Full EPSS history (29 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-1968

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.7 3.1 LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 1.4 [email protected]
3.7 3.1 LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 1.4 134c704f-9b21-4f2e-91b3-4a467353bcc0
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2020-1968

GitHub Security Advisory for CVE-2020-1968

GHSA-mh8f-5gw2-5wgh · Severity: medium — The Raccoon attack exploits a flaw in the TLS specification which can lead to an attacker being...

OS Trackers for CVE-2020-1968

vendor priority summary link
debian not yet assigned CVE-2020-1968 not yet assigned priority: Debian including 1 source packages (openssl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-1968
gentoo normal CVE-2020-1968: 1 GLSA(s) (202210-02), 1 atom(s) (dev-libs/openssl); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-1968
redhat low — https://access.redhat.com/security/cve/CVE-2020-1968
suse medium CVE-2020-1968 severity moderate: SUSE including 34 source package names (libopenssl-1_0_0-devel, libopenssl-1_0_0-devel-32bit, …), 268 product×package rows across 54 product lines (Image SLES12-SP5-Azure-SAP-BYOS, Image SLES12-SP5-Azure-SAP-On-Demand, … (54 product lines)): Known Not Affected 213, Fixed 55. https://www.suse.com/security/cve/CVE-2020-1968/
ubuntu low CVE-2020-1968 low priority: Ubuntu including 4 source packages (edk2, nodejs, openssl, openssl1.0), 64 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 41, DNE 15, released 4, needs-triage 3, needed 1. https://ubuntu.com/security/CVE-2020-1968

Affected software / configurations for CVE-2020-1968

Vendor Product Version Raw CPE
openssl openssl >= 1.0.2, <= 1.0.2v cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
oracle jd_edwards_world_security a9.4 cpe:2.3:a:oracle:jd_edwards_world_security:a9.4:*:*:*:*:*:*:*
oracle peoplesoft_enterprise_peopletools 8.56 cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.56:*:*:*:*:*:*:*
oracle peoplesoft_enterprise_peopletools 8.57 cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.57:*:*:*:*:*:*:*
oracle peoplesoft_enterprise_peopletools 8.58 cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:*
oracle ethernet_switch_es2-64_firmware 2.0.0.14 cpe:2.3:o:oracle:ethernet_switch_es2-64_firmware:2.0.0.14:*:*:*:*:*:*:*
oracle ethernet_switch_es2-72_firmware 2.0.0.14 cpe:2.3:o:oracle:ethernet_switch_es2-72_firmware:2.0.0.14:*:*:*:*:*:*:*
fujitsu m10-1_firmware < xcp2400 cpe:2.3:o:fujitsu:m10-1_firmware:*:*:*:*:*:*:*:*
fujitsu m10-4_firmware < xcp2400 cpe:2.3:o:fujitsu:m10-4_firmware:*:*:*:*:*:*:*:*
fujitsu m10-4s_firmware < xcp2400 cpe:2.3:o:fujitsu:m10-4s_firmware:*:*:*:*:*:*:*:*
fujitsu m12-1_firmware < xcp2400 cpe:2.3:o:fujitsu:m12-1_firmware:*:*:*:*:*:*:*:*
fujitsu m12-2_firmware < xcp2400 cpe:2.3:o:fujitsu:m12-2_firmware:*:*:*:*:*:*:*:*
fujitsu m12-2s_firmware < xcp2400 cpe:2.3:o:fujitsu:m12-2s_firmware:*:*:*:*:*:*:*:*
fujitsu m10-1_firmware < xcp3100 cpe:2.3:o:fujitsu:m10-1_firmware:*:*:*:*:*:*:*:*
fujitsu m10-4_firmware < xcp3100 cpe:2.3:o:fujitsu:m10-4_firmware:*:*:*:*:*:*:*:*
fujitsu m10-4s_firmware < xcp3100 cpe:2.3:o:fujitsu:m10-4s_firmware:*:*:*:*:*:*:*:*
fujitsu m12-1_firmware < xcp3100 cpe:2.3:o:fujitsu:m12-1_firmware:*:*:*:*:*:*:*:*
fujitsu m12-2_firmware < xcp3100 cpe:2.3:o:fujitsu:m12-2_firmware:*:*:*:*:*:*:*:*
fujitsu m12-2s_firmware < xcp3100 cpe:2.3:o:fujitsu:m12-2s_firmware:*:*:*:*:*:*:*:*
oracle ethernet_switch_es1-24_firmware 1.3.1 cpe:2.3:o:oracle:ethernet_switch_es1-24_firmware:1.3.1:*:*:*:*:*:*:*
oracle ethernet_switch_tor-72_firmware 1.2.2 cpe:2.3:o:oracle:ethernet_switch_tor-72_firmware:1.2.2:*:*:*:*:*:*:*

References for CVE-2020-1968

cvelogic Threat Intelligence