CVE-2016-0800: The SSLv2 protocol, as used in OpenSSL before 1.0.1s and 1.0.2 before 1.0.2g and other products, requires a server to send a ServerVerify…
Noroxi assessment
Priority: This week (action score 60/100)
- A ready-made attack module is public (Metasploit); exploiting it takes no special expertise.
- A ready-made attack tool exists and the flaw can be exploited over the network without an account, so priority is at least “This week”.
- Probability of exploitation in the next 30 days: 82.1% (FIRST EPSS); higher than 99.6% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
- Fixed version: nss (Debian:12) 3.13; openssl (Debian:12) 1.0.0c-2; openssl (Red Hat:enterprise_linux:5::client) 0:0.9.8e-39.el5_11.
Don’t wait for the next maintenance window. Upgrade to nss (Debian:12) 3.13; openssl (Debian:12) 1.0.0c-2; openssl (Red Hat:enterprise_linux:5::client) 0:0.9.8e-39.el5_11 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
The SSLv2 protocol, as used in OpenSSL before 1.0.1s and 1.0.2 before 1.0.2g and other products, requires a server to send a ServerVerify message before establishing that a client possesses certain plaintext RSA data, which makes it easier for remote attackers to decrypt TLS ciphertext data by leveraging a Bleichenbacher RSA padding oracle, aka a "DROWN" attack.
- Published
- Mar 1, 2016
- Updated
- Jun 16, 2026
- EPSS
- 82.1% · 99th percentile
- CWE
- CWE-200
Report tools
Action score
60
Don’t wait for the next maintenance window.
- CVSS
- 23 / 40 · 5.9 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 25 / 30 · 82.1%
- Ready-made attack tool
- 12 / 60 · floor: at least 60
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Weaponized exploit exists
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Check your server's TLS configurationRun the SSL check
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| openssl | openssl | cpe:2.3:a:openssl:openssl |
| pulsesecure | client | cpe:2.3:a:pulsesecure:client |
| pulsesecure | steel belted radius | cpe:2.3:a:pulsesecure:steel_belted_radius |
Check your server's TLS configuration
The OpenSSL version can't be seen from outside; the free SSL checker tests your certificate, enabled TLS versions and weak ciphers. Confirm the version on your server with the package manager.
Run the SSL checkAffected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- openssl openssl1.0.1
- openssl openssl1.0.1a
- openssl openssl1.0.1b
- openssl openssl1.0.1c
- openssl openssl1.0.1d
- openssl openssl1.0.1e
- openssl openssl1.0.1f
- openssl openssl1.0.1g
+12 more rows
- openssl openssl1.0.1h
- openssl openssl1.0.1i
- openssl openssl1.0.1j
- openssl openssl1.0.1k
- openssl openssl1.0.1l
- openssl openssl1.0.1m
- openssl openssl1.0.1n
- openssl openssl1.0.1o
- openssl openssl1.0.1p
- openssl openssl1.0.1q
- openssl openssl1.0.1r
- openssl openssl1.0.2
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | nss | before 3.13 | 3.13 |
| Debian:12 | openssl | before 1.0.0c-2 | 1.0.0c-2 |
| Red Hat:enterprise_linux:5::client | openssl | before 0:0.9.8e-39.el5_11 | 0:0.9.8e-39.el5_11 |
| Red Hat:enterprise_linux:5::client | openssl-debuginfo | before 0:0.9.8e-39.el5_11 | 0:0.9.8e-39.el5_11 |
| Red Hat:enterprise_linux:5::client | openssl-perl | before 0:0.9.8e-39.el5_11 | 0:0.9.8e-39.el5_11 |
| Red Hat:enterprise_linux:5::client_workstation | openssl-devel | before 0:0.9.8e-39.el5_11 | 0:0.9.8e-39.el5_11 |
| Red Hat:enterprise_linux:6::client | openssl | before 0:1.0.1e-42.el6_7.4 | 0:1.0.1e-42.el6_7.4 |
| Red Hat:enterprise_linux:6::client | openssl-debuginfo | before 0:1.0.1e-42.el6_7.4 | 0:1.0.1e-42.el6_7.4 |
| Red Hat:enterprise_linux:6::client | openssl-devel | before 0:1.0.1e-42.el6_7.4 | 0:1.0.1e-42.el6_7.4 |
| Red Hat:enterprise_linux:6::client | openssl-perl | before 0:1.0.1e-42.el6_7.4 | 0:1.0.1e-42.el6_7.4 |
| Red Hat:enterprise_linux:6::client | openssl-static | before 0:1.0.1e-42.el6_7.4 | 0:1.0.1e-42.el6_7.4 |
| Red Hat:enterprise_linux:6::client | openssl098e | before 0:0.9.8e-20.el6_7.1 | 0:0.9.8e-20.el6_7.1 |
| Red Hat:enterprise_linux:6::client | openssl098e-debuginfo | before 0:0.9.8e-20.el6_7.1 | 0:0.9.8e-20.el6_7.1 |
| Red Hat:enterprise_linux:6::hypervisor | rhev-hypervisor7 | before 0:7.2-20160302.1.el6ev | 0:7.2-20160302.1.el6ev |
| Red Hat:enterprise_linux:7::client | openssl | before 1:1.0.1e-51.el7_2.4 | 1:1.0.1e-51.el7_2.4 |
| Red Hat:enterprise_linux:7::client | openssl-debuginfo | before 1:1.0.1e-51.el7_2.4 | 1:1.0.1e-51.el7_2.4 |
| Red Hat:enterprise_linux:7::client | openssl-devel | before 1:1.0.1e-51.el7_2.4 | 1:1.0.1e-51.el7_2.4 |
| Red Hat:enterprise_linux:7::client | openssl-libs | before 1:1.0.1e-51.el7_2.4 | 1:1.0.1e-51.el7_2.4 |
| Red Hat:enterprise_linux:7::client | openssl-perl | before 1:1.0.1e-51.el7_2.4 | 1:1.0.1e-51.el7_2.4 |
| Red Hat:enterprise_linux:7::client | openssl-static | before 1:1.0.1e-51.el7_2.4 | 1:1.0.1e-51.el7_2.4 |
| Red Hat:enterprise_linux:7::client | openssl098e | before 0:0.9.8e-29.el7_2.3 | 0:0.9.8e-29.el7_2.3 |
| Red Hat:enterprise_linux:7::client | openssl098e-debuginfo | before 0:0.9.8e-29.el7_2.3 | 0:0.9.8e-29.el7_2.3 |
| Red Hat:enterprise_linux:7::hypervisor | rhev-hypervisor7 | before 0:7.2-20160302.1.el7ev | 0:7.2-20160302.1.el7ev |
| Red Hat:rhel_aus:5.9 | openssl | before 0:0.9.8e-26.el5_9.5 | 0:0.9.8e-26.el5_9.5 |
+50
Same product
openssl: all recordsOther highest-scoring records for the same primary product.
- CVE-2014-0160The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows…KEV90Now
- CVE-2021-3711SM2 Decryption Buffer Overflow65This week
- CVE-2003-0545Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code…65This week
Published before and after this one in the same product
- ← EarlierCVE-2015-3197Feb 14, 2016 · ssl/s2_srvr.c in OpenSSL 1.0.1 before 1.0.1r and 1.0.2 before 1.0.2f does not prevent use of disabled ciphers, which makes it easier for…26Monitor
- ← EarlierCVE-2016-0701Feb 14, 2016 · The DH_check_pub_key function in crypto/dh/dh_check.c in OpenSSL 1.0.2 before 1.0.2f does not ensure that prime numbers are appropriate for…39Monitor
- Later →CVE-2016-0703Mar 2, 2016 · The get_client_master_key function in s2_srvr.c in the SSLv2 implementation in OpenSSL before 0.9.8zf, 1.0.0 before 1.0.0r, 1.0.1 before…25Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:nss | 3.13 · Debian:12 | Package registry (OSV) |
| debian:openssl | 1.0.0c-2 · Debian:12 | Package registry (OSV) |
| red hat:openssl | 0:1.0.1e-42.el6_7.4 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-debuginfo | 0:1.0.1e-42.el6_7.4 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-devel | 0:1.0.1e-42.el6_7.4 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-libs | 1:1.0.1e-51.el7_2.4 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-perl | 0:1.0.1e-42.el6_7.4 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-static | 0:1.0.1e-42.el6_7.4 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl098e | 0:0.9.8e-20.el6_7.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl098e-debuginfo | 0:0.9.8e-20.el6_7.1 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:rhev-hypervisor7 | 0:7.2-20160302.1.el6ev · Red Hat:enterprise_linux:6::hypervisor | Package registry (OSV) |
| suse:compat-openssl097g | 0.9.7g-146.22.41.1 · SUSE:Linux Enterprise Desktop 11 SP4 | Package registry (OSV) |
| suse:compat-openssl098 | 0.9.8j-94.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:openssl | 1.0.1i-27.13.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:openssl1 | 1.0.1g-0.40.1 · SUSE:Linux Enterprise Server 11-SECURITY | Package registry (OSV) |
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Evidence
- Metasploit module ×1
- Proof-of-concept repository on GitHub ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Metasploit module | auxiliary/scanner/ssl/ssl_versionSSL/TLS Version Detectionauxiliary | 2014-10-14 |
| Proof-of-concept repository on GitHub | stars:5 | 2021-01-01 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Metasploit-505 d
- Published
- First PoC+1766 d
- TodayNov 15, 2026+3911 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-200 · Exposure of Sensitive Information to an Unauthorized ActorCVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
nvd-primary
Root cause
The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.
The bug in code
The whole CWE-200 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
{
"permissions": ["tabs", "<all_urls>"],
"background": { "service_worker": "analytics.js" }
}Fixed
{
"permissions": ["activeTab"],
"host_permissions": ["https://yildiz.example/*"]
}Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- ExcavationCAPEC-116likelihood: High · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
- FootprintingCAPEC-169likelihood: High · Very Low
- Exploiting Trust in ClientCAPEC-22likelihood: High · High
- FingerprintingCAPEC-224likelihood: High · Very Low
- ICMP Echo Request PingCAPEC-285likelihood: Medium · Low
- TCP SYN ScanCAPEC-287Low
- Enumerate Mail Exchange (MX) RecordsCAPEC-290Low
ATT&CK techniques
- System Service DiscoveryT1007
- System Network Configuration DiscoveryT1016
- Remote System DiscoveryT1018
- System Owner/User DiscoveryT1033
- Masquerading: Match Legitimate Name or LocationT1036.005
- Network Service ScanningT1046
- System Network Connections DiscoveryT1049
- Process DiscoveryT1057
- Permission Groups DiscoveryT1069
- System Information DiscoveryT1082
- File and Directory DiscoveryT1083
- Account DiscoveryT1087
- Multi-Factor Authentication InterceptionT1111
- Peripheral Device DiscoveryT1120
- System Time DiscoveryT1124
- Access Token Manipulation:Token Impersonation/TheftT1134.001
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00001.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00002.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00003.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00004.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00005.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00006.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00007.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00009.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00010.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00011.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00012.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00017.html
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00025.html
- lists.opensuse.org/opensuse-security-announce/2016-04/msg00038.html
- lists.opensuse.org/opensuse-security-announce/2016-05/msg00015.html
- lists.opensuse.org/opensuse-security-announce/2016-05/msg00017.html
- marc.info/?l=bugtraq&m=145983526810210&w=2
- marc.info/?l=bugtraq&m=146108058503441&w=2
Vendor advisories and official records. Exploit/PoC links are deliberately left out.