CVE-2020-1968 (GCVE-0-2020-1968)

Vulnerability from cvelistv5 – Published: 2020-09-09 13:50 – Updated: 2026-04-16 14:10
VLAI
Title
Raccoon attack
Summary
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).
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • Protocol flaw
  • CWE-203 - Observable Discrepancy
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: Fixed in OpenSSL 1.0.2w (Affected 1.0.2-1.0.2v)
Create a notification for this product.
Date Public
2020-09-09 00:00
Credits
Robert Merget, Marcus Brinkmann, Nimrod Aviram, and Juraj Somorovsky
Show details on NVD website
To clipboard 

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      "id": "CVE-2020-1968",
      "lastModified": "2024-11-21T05:11:45.367",
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      "published": "2020-09-09T14:15:12.507",
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      "sourceIdentifier": "openssl-security@openssl.org",
      "vulnStatus": "Modified",
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    },
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://www.openssl.org/news/secadv/20200909.txt\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://usn.ubuntu.com/4504-1/\", \"name\": \"USN-4504-1\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2020/09/msg00016.html\", \"name\": \"[debian-lts-announce] 20200925 [SECURITY] [DLA 2378-1] openssl1.0 security update\", \"tags\": [\"mailing-list\", \"x_transferred\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpujan2021.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20200911-0004/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuApr2021.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://www.oracle.com//security-alerts/cpujul2021.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2022.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.gentoo.org/glsa/202210-02\", \"name\": \"GLSA-202210-02\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T06:54:00.367Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 3.7, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"LOW\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2020-1968\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-16T14:10:30.475111Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-203\", \"description\": \"CWE-203 Observable Discrepancy\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-16T14:10:03.734Z\"}}], \"cna\": {\"title\": \"Raccoon attack\", \"credits\": [{\"lang\": \"en\", \"value\": \"Robert Merget, Marcus Brinkmann, Nimrod Aviram, and Juraj Somorovsky\"}], \"metrics\": [{\"other\": {\"type\": \"unknown\", \"content\": {\"url\": \"https://www.openssl.org/policies/secpolicy.html#Low\", \"lang\": \"eng\", \"value\": \"Low\"}}}], \"affected\": [{\"vendor\": \"OpenSSL\", \"product\": \"OpenSSL\", \"versions\": [{\"status\": \"affected\", \"version\": \"Fixed in OpenSSL 1.0.2w (Affected 1.0.2-1.0.2v)\"}]}], \"datePublic\": \"2020-09-09T00:00:00.000Z\", \"references\": [{\"url\": \"https://www.openssl.org/news/secadv/20200909.txt\"}, {\"url\": \"https://usn.ubuntu.com/4504-1/\", \"name\": \"USN-4504-1\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2020/09/msg00016.html\", \"name\": \"[debian-lts-announce] 20200925 [SECURITY] [DLA 2378-1] openssl1.0 security update\", \"tags\": [\"mailing-list\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpujan2021.html\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20200911-0004/\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuApr2021.html\"}, {\"url\": \"https://www.oracle.com//security-alerts/cpujul2021.html\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2022.html\"}, {\"url\": \"https://security.gentoo.org/glsa/202210-02\", \"name\": \"GLSA-202210-02\", \"tags\": [\"vendor-advisory\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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).\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"Protocol flaw\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2022-10-16T00:00:00.000Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2020-1968\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-16T14:10:35.131Z\", \"dateReserved\": \"2019-12-03T00:00:00.000Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2020-09-09T13:50:12.423Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.