CVE-2015-4000

low

Published 2015-05-21 · Modified 2026-05-27

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CVSS v3

3.7

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v4 NEW

—

not yet in upstream

VIR risk

4.7

Description

The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the "Logjam" issue.

Predictions

Exploit likelihood

82%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Metasploit modules

auxiliary_scanner/ssl/ssl_version rank 300

SSL/TLS Version Detection

Source code queued for fetch — refresh in a moment.

OS impact

macOS Affected 1 release

Version	Status	Fixed in
—	Affected	—

SUSE Affected 3 releases

Version	Status	Fixed in
12	Affected	—
11.0	Affected	—
—	Affected	—

Ubuntu Affected 4 releases

Version	Status	Fixed in
15.04	Affected	—
14.10	Affected	—
14.04	Affected	—
12.04	Affected	—

Debian Mixed 7 releases

Version	Status	Fixed in
trixie	Fixed	`2:3.19.1-1`
sid	Fixed	`2:3.19.1-1`
forky	Fixed	`2:3.19.1-1`
bullseye	Fixed	`2:3.19.1-1`
bookworm	Fixed	`2:3.19.1-1`
8.0	Affected	—
7.0	Affected	—

Application impact

Vendor	Product	Versions
openssl	openssl	`{"startIncluding":"1.0.1","endIncluding":"1.0.1m"}`
ibm	content_manager	`8.5`
oracle	jrockit	`r28.3.6`
oracle	jdk	`1.6.0`
oracle	jdk	`1.7.0`
oracle	jdk	`1.8.0`
oracle	jre	`1.6.0`
oracle	jre	`1.7.0`
oracle	jre	`1.8.0`
mozilla	network_security_services	`3.19`
oracle	sparc-opl_service_processor	`{"endIncluding":"1121"}`
apple	safari	`-`
google	chrome	`-`
microsoft	internet_explorer	`-`
mozilla	firefox	`-`
opera	opera_browser	`-`
mozilla	firefox	`38.1.0`
mozilla	firefox	`39.0`
mozilla	firefox_esr	`31.8`
mozilla	seamonkey	`2.35`
mozilla	thunderbird	`31.8`
mozilla	thunderbird	`38.1`

References

CWEs

CWE-310 CWE-295

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.