CVE-2009-3555
CriticalExploitedPublic exploitThe TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft Internet Information Services (IIS) 7.0, mod_ssl in the Apache HTTP Server 2.2.14 and earlier, OpenSSL before 0.9.8l, GnuTLS 2.8.5 and earlier, Mozilla Network Security Services (NSS) 3.12.4…
Published Jun 10, 2022 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2009-3555, DLA-400-1, DSA-2141-1, DSA-2141-2, DSA-2626-1, DSA-3253-1, GHSA-f7w7-6pjc-wwm6, TR-22-0412
Key Facts
Patch immediately- CVE-2009-3555 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting HTTP Server (Apache), Nginx (F5), Gnutls and 22 more products.
- It is exploited in the wild, listed in Industry KEV feed since Nov 18, 2009. Public exploit code is available.
- EPSS estimates a 87% probability of exploitation in the next 30 days.
- Fixed versions are available, including aether 0:1.13.1-13.el7, ant 0:1.9.2-9.el7, aopalliance 0:1.0-8.el7.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
87%
Higher than 99.7% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2009-3555 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft Internet Information Services (IIS) 7.0, mod_ssl in the Apache HTTP Server 2.2.14 and earlier, OpenSSL before 0.9.8l, GnuTLS 2.8.5 and earlier, Mozilla Network Security Services (NSS) 3.12.4 and earlier, multiple Cisco products, and other products, does not properly associate renegotiation handshakes with an existing connection, which allows man-in-the-middle attackers to insert data into HTTPS sessions, and possibly other types of sessions protected by TLS or SSL, by sending an unauthenticated request that is processed retroactively by a server in a post-renegotiation context, related to a "plaintext injection" attack, aka the "Project Mogul" issue.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Nov 18, 2009 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
520 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| HTTP ServerApache | See advisory | 2.2.14 |
| NginxF5 | See advisory | 0.8.22 |
| GnutlsGnu | See advisory | 2.8.5 |
| NssMozilla | See advisory | 3.12.4 |
| OpensslOpenssl | 1.0 | 0.9.8k |
Patched Releases
aether
0:1.13.1-13.el7
ant
0:1.9.2-9.el7
aopalliance
0:1.0-8.el7
HTTP Server
<=2.2.14
apache-commons-codec-eap6
0:1.4-16.redhat_3.1.ep6.el7
apache-commons-net
0:3.2-8.el7
apache-ivy
0:2.3.0-4.el7
apache-mime4j
0:0.6-10.redhat_3.1.ep6.el7
apache-parent
0:10-14.el7
apache-resource-bundles
0:2-11.el7
apache2
2.2.14-2, 2.2.3-4+etch11, 2.2.9-10+lenny6, 2.4.23-4.1
apache2-devel
2.4.23-4.1
apache2-doc
2.4.23-4.1
apache2-event
2.4.23-4.1
apache2-example-pages
2.4.23-4.1
apache2-prefork
2.4.23-4.1
apache2-utils
2.4.23-4.1
apache2-worker
2.4.23-4.1
atinject
0:1-13.20100611svn86.el7
bouncycastle
0:1.46-7.el7
bsf
0:2.4.0-19.el7
c3p0
0:0.9.1.2-3.ep6.el7
candlepin
0:0.9.49.3-1.el7
candlepin-common
0:1.0.22-1.el7
candlepin-guice
0:3.0-2_redhat_1.el7
Timeline
Added to Industry KEV feed
Nov 18, 2009
Publicly disclosed
Jun 10, 2022
Last updated
Aug 4, 2026
Weakness Type
- CWE-295 Improper Certificate Validation
- CWE-300 Channel Accessible by Non-Endpoint
References
FAQ
Common Questions.
The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft Internet Information Services (IIS) 7.0, mod_ssl in the Apache HTTP Server 2.2.14 and earlier, OpenSSL before 0.9.8l, GnuTLS 2.8.5 and earlier, Mozilla Network Security Services (NSS) 3.12.4 and earlier, multiple Cisco products, and…
Affected: HTTP Server (Apache); Nginx (F5); Gnutls, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Nov 18, 2009.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including aether 0:1.13.1-13.el7, ant 0:1.9.2-9.el7, aopalliance 0:1.0-8.el7.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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