CVE-2020-1968 (GCVE-0-2020-1968)
Vulnerability from cvelistv5 – Published: 2020-09-09 13:50 – Updated: 2026-04-16 14:10
VLAI
EPSS
VEX
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
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-16 14:10 UTC
CWE
- Protocol flaw
- CWE-203 - Observable Discrepancy
Assigner
References
10 references
Impacted products
Date Public
2020-09-09 00:00
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"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)."
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{
"lang": "es",
"value": "El ataque Raccoon explota un fallo en la especificaci\u00f3n TLS que puede conllevar a que un atacante sea capaz de calcular el secreto pre-master en conexiones que han usado un conjunto de cifrado basado en Diffie-Hellman (DH).\u0026#xa0;En tal caso, esto har\u00eda que el atacante pudiera espiar todas las comunicaciones cifradas enviadas por medio de esa conexi\u00f3n TLS.\u0026#xa0;El ataque solo puede ser explotado si una implementaci\u00f3n reutiliza un secreto de DH en varias conexiones TLS.\u0026#xa0;Tome en cuenta que este problema solo afecta a los conjuntos de cifrado DH y no a los conjuntos de cifrado ECDH.\u0026#xa0;Este problema afecta a OpenSSL versi\u00f3n 1.0.2, que no es compatible y ya no recibe actualizaciones p\u00fablicas.\u0026#xa0;OpenSSL versi\u00f3n 1.1.1 no es vulnerable a este problema.\u0026#xa0;Corregido en OpenSSL versi\u00f3n 1.0.2w (Afectadas versiones 1.0.2-1.0.2v)."
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"value": "El ataque Raccoon explota un fallo en la especificaci\u00f3n TLS que puede conllevar a que un atacante sea capaz de calcular el secreto pre-master en conexiones que han usado un conjunto de cifrado basado en Diffie-Hellman (DH).\u0026#xa0;En tal caso, esto har\u00eda que el atacante pudiera espiar todas las comunicaciones cifradas enviadas por medio de esa conexi\u00f3n TLS.\u0026#xa0;El ataque solo puede ser explotado si una implementaci\u00f3n reutiliza un secreto de DH en varias conexiones TLS.\u0026#xa0;Tome en cuenta que este problema solo afecta a los conjuntos de cifrado DH y no a los conjuntos de cifrado ECDH.\u0026#xa0;Este problema afecta a OpenSSL versi\u00f3n 1.0.2, que no es compatible y ya no recibe actualizaciones p\u00fablicas.\u0026#xa0;OpenSSL versi\u00f3n 1.1.1 no es vulnerable a este problema.\u0026#xa0;Corregido en OpenSSL versi\u00f3n 1.0.2w (Afectadas versiones 1.0.2-1.0.2v)."
}
],
"id": "CVE-2020-1968",
"lastModified": "2026-04-16T15:16:41.387",
"metrics": {
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"baseScore": 4.3,
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"integrityImpact": "NONE",
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"sourceIdentifier": "openssl-security@openssl.org",
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],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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},
"redhat_vex": {
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"current_release_date": "2026-06-28T12:03:21+00:00",
"cve": "CVE-2020-1968",
"id": "CVE-2020-1968",
"initial_release_date": "2020-09-09T00:00:00+00:00",
"product_status:known_affected": "25",
"product_status:known_not_affected": "11",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "openssl: Information exposure when DH secret are reused across multiple TLS connections",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-1968.json",
"version": "3"
},
"suse_vex": {
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"cve": "CVE-2020-1968",
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"initial_release_date": "2023-02-15T04:04:08Z",
"product_status:known_not_affected": "393",
"product_status:recommended": "65",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2020-1968",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-1968.json",
"version": "21"
},
"vulnrichment": {
"containers": {
"adp": [
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"dateUpdated": "2024-08-04T06:54:00.367Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"url": "https://usn.ubuntu.com/4504-1/"
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"title": "CVE Program Container"
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"attackComplexity": "HIGH",
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"role": "CISA Coordinator",
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"shortName": "CISA-ADP"
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],
"cna": {
"affected": [
{
"product": "OpenSSL",
"vendor": "OpenSSL",
"versions": [
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"status": "affected",
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}
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],
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"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)."
}
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"name": "GLSA-202210-02",
"tags": [
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"url": "https://security.gentoo.org/glsa/202210-02"
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],
"title": "Raccoon attack"
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},
"cveMetadata": {
"assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
"assignerShortName": "openssl",
"cveId": "CVE-2020-1968",
"datePublished": "2020-09-09T13:50:12.423Z",
"dateReserved": "2019-12-03T00:00:00.000Z",
"dateUpdated": "2026-04-16T14:10:35.131Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.