CVE-2016-2842: The doapr_outch function in crypto/bio/b_print.c in OpenSSL 1.0.1 before 1.0.1s and 1.0.2 before 1.0.2g does not verify that a certain…
Noroxi assessment
Priority: Plan (action score 55/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 53.6% (FIRST EPSS); higher than 99% 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. No special conditions are required; it is repeatable.
- Fixed version: openssl (Debian:12) 1.0.2g-1; openssl (Debian:7) 1.0.1e-2+deb7u20; openssl (Debian:8) 1.0.1k-3+deb8u4.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Add it to your regular patch cycle. Upgrade to openssl (Debian:12) 1.0.2g-1; openssl (Debian:7) 1.0.1e-2+deb7u20; openssl (Debian:8) 1.0.1k-3+deb8u4 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 doapr_outch function in crypto/bio/b_print.c in OpenSSL 1.0.1 before 1.0.1s and 1.0.2 before 1.0.2g does not verify that a certain memory allocation succeeds, which allows remote attackers to cause a denial of service (out-of-bounds write or memory consumption) or possibly have unspecified other impact via a long string, as demonstrated by a large amount of ASN.1 data, a different vulnerability than CVE-2016-0799.
- Published
- Mar 3, 2016
- Updated
- Jun 16, 2026
- EPSS
- 53.6% · 99th percentile
- CWE
- CWE-119
Report tools
Action score
55
Add it to your regular patch cycle.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 16 / 30 · 53.6%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- 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
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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 |
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 | openssl | before 1.0.2g-1 | 1.0.2g-1 |
| Debian:7 | openssl | before 1.0.1e-2+deb7u20 | 1.0.1e-2+deb7u20 |
| Debian:8 | openssl | before 1.0.1k-3+deb8u4 | 1.0.1k-3+deb8u4 |
| Red Hat:enterprise_linux:6::client | openssl | before 0:1.0.1e-48.el6_8.1 | 0:1.0.1e-48.el6_8.1 |
| Red Hat:enterprise_linux:6::client | openssl-debuginfo | before 0:1.0.1e-48.el6_8.1 | 0:1.0.1e-48.el6_8.1 |
| Red Hat:enterprise_linux:6::client | openssl-devel | before 0:1.0.1e-48.el6_8.1 | 0:1.0.1e-48.el6_8.1 |
| Red Hat:enterprise_linux:6::client | openssl-perl | before 0:1.0.1e-48.el6_8.1 | 0:1.0.1e-48.el6_8.1 |
| Red Hat:enterprise_linux:6::client | openssl-static | before 0:1.0.1e-48.el6_8.1 | 0:1.0.1e-48.el6_8.1 |
| Red Hat:enterprise_linux:7::client | openssl | before 1:1.0.1e-51.el7_2.5 | 1:1.0.1e-51.el7_2.5 |
| Red Hat:enterprise_linux:7::client | openssl-debuginfo | before 1:1.0.1e-51.el7_2.5 | 1:1.0.1e-51.el7_2.5 |
| Red Hat:enterprise_linux:7::client | openssl-devel | before 1:1.0.1e-51.el7_2.5 | 1:1.0.1e-51.el7_2.5 |
| Red Hat:enterprise_linux:7::client | openssl-libs | before 1:1.0.1e-51.el7_2.5 | 1:1.0.1e-51.el7_2.5 |
| Red Hat:enterprise_linux:7::client | openssl-perl | before 1:1.0.1e-51.el7_2.5 | 1:1.0.1e-51.el7_2.5 |
| Red Hat:enterprise_linux:7::client | openssl-static | before 1:1.0.1e-51.el7_2.5 | 1:1.0.1e-51.el7_2.5 |
| Red Hat:rhel_eus:6.7::computenode | openssl | before 0:1.0.1e-42.el6_7.5 | 0:1.0.1e-42.el6_7.5 |
| Red Hat:rhel_eus:6.7::computenode | openssl-debuginfo | before 0:1.0.1e-42.el6_7.5 | 0:1.0.1e-42.el6_7.5 |
| Red Hat:rhel_eus:6.7::computenode | openssl-devel | before 0:1.0.1e-42.el6_7.5 | 0:1.0.1e-42.el6_7.5 |
| Red Hat:rhel_eus:6.7::computenode | openssl-perl | before 0:1.0.1e-42.el6_7.5 | 0:1.0.1e-42.el6_7.5 |
| Red Hat:rhel_eus:6.7::computenode | openssl-static | before 0:1.0.1e-42.el6_7.5 | 0:1.0.1e-42.el6_7.5 |
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-2016-0798Mar 3, 2016 · Memory leak in the SRP_VBASE_get_by_user implementation in OpenSSL 1.0.1 before 1.0.1s and 1.0.2 before 1.0.2g allows remote attackers to…37Monitor
- ← EarlierCVE-2016-0799Mar 3, 2016 · The fmtstr function in crypto/bio/b_print.c in OpenSSL 1.0.1 before 1.0.1s and 1.0.2 before 1.0.2g improperly calculates string lengths…49Plan
- Later →CVE-2016-2105May 4, 2016 · Integer overflow in the EVP_EncodeUpdate function in crypto/evp/encode.c in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h allows remote…42Plan
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:openssl | 1.0.2g-1 · Debian:12 | Package registry (OSV) |
| red hat:openssl | 1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-debuginfo | 1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-devel | 1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-libs | 1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-perl | 1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-static | 1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
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.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-21-0167 · Feb 24, 2021(Advantech Güvenlik Bildirimi)
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.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory BufferCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
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)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Overflow BuffersCAPEC-100likelihood: High · Very High
- Buffer ManipulationCAPEC-123likelihood: High · Very High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
- Filter Failure through Buffer OverflowCAPEC-24likelihood: High · High
- MIME ConversionCAPEC-42likelihood: High · High
- Overflow Binary Resource FileCAPEC-44likelihood: High · Very High
- Buffer Overflow via Symbolic LinksCAPEC-45likelihood: High · High
ATT&CK techniques
—
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- marc.info/?l=bugtraq&m=146108058503441&w=2
- openssl.org/news/secadv/20160301.txt
- rhn.redhat.com/errata/RHSA-2016-0722.html
- rhn.redhat.com/errata/RHSA-2016-0996.html
- rhn.redhat.com/errata/RHSA-2016-2073.html
- rhn.redhat.com/errata/RHSA-2016-2957.html
- www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- www.securityfocus.com/bid/84169
- git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=578b956fe741bf8e84055547b1e83c28dd902c73
- h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03741en_us
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05068681
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05086877
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05111017
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05126404
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05131085
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05135617
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05141441
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05150736
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05150800
Vendor advisories and official records. Exploit/PoC links are deliberately left out.