Executive Summary

Informations
Name CVE-2021-38507 First vendor Publication 2021-12-08
Vendor Cve Last vendor Modification 2022-12-09

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Overall CVSS Score 6.5
Base Score 6.5 Environmental Score 6.5
impact SubScore 3.6 Temporal Score 6.5
Exploitabality Sub Score 2.8
 
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction Required
Scope Unchanged Confidentiality Impact None
Integrity Impact High Availability Impact None
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Cvss Base Score 4.3 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port 8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38507

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-346 Origin Validation Error

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 544
Application 133
Application 417
Os 3

Sources (Detail)

Source Url
DEBIAN https://www.debian.org/security/2021/dsa-5026
https://www.debian.org/security/2022/dsa-5034
GENTOO https://security.gentoo.org/glsa/202202-03
https://security.gentoo.org/glsa/202208-14
MISC https://bugzilla.mozilla.org/show_bug.cgi?id=1730935
https://www.mozilla.org/security/advisories/mfsa2021-48/
https://www.mozilla.org/security/advisories/mfsa2021-49/
https://www.mozilla.org/security/advisories/mfsa2021-50/
MLIST https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html

Alert History

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Date Informations
2024-02-10 02:20:24
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2023-09-05 13:22:20
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2023-09-02 13:20:44
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2023-09-02 01:24:30
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2023-08-12 13:26:48
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2023-08-12 01:23:43
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2023-08-11 13:19:04
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2023-08-11 01:24:30
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2023-08-06 13:17:01
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2023-08-06 01:23:27
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2023-08-04 13:17:24
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2023-08-04 01:23:49
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2023-07-14 13:17:28
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2023-07-14 01:23:36
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2023-04-01 02:08:01
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2023-03-29 02:19:34
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2023-03-28 12:23:49
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2022-12-09 21:27:39
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2022-10-11 13:09:04
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2022-10-11 01:23:15
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2022-08-11 00:43:22
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2022-04-26 02:00:00
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2022-03-16 21:23:08
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2022-02-22 09:23:07
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2022-01-04 17:23:01
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2022-01-03 17:22:59
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2021-12-29 21:23:03
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2021-12-22 00:23:05
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2021-12-20 05:23:16
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2021-12-10 21:23:00
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2021-12-09 09:22:59
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2021-12-09 00:22:54
  • First insertion