CVE-2012-2110Openssl Memory Corruption
The asn1_d2i_read_bio function in crypto/asn1/a_d2i_fp.c in OpenSSL before 0.9.8v, 1.0.0 before 1.0.0i, and 1.0.1 before 1.0.1a does not properly interpret integer data, which allows remote attackers to conduct buffer overflow attacks, and cause a denial of service (memory…
Published Apr 19, 2012 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2012-2110
Key Facts
Patch immediately- CVE-2012-2110 is a high-severity vulnerability (CVSS 7.5 v2) affecting Openssl, rootio-openssl, openssl098e (amazon) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 48% probability of exploitation in the next 30 days.
- Fixed versions are available, including compat-openssl097g 0.9.7g-146.22.1, compat-openssl097g-32bit 0.9.7g-146.22.1, libopenssl-1_1-devel 1.1.1l-1.2.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v2
7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P
EPSS (30-day exploit likelihood)
48%
Higher than 98.8% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
46/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2012-2110
- advisoryRHSA-2012:0518
- advisoryRHSA-2012:0522
- advisoryRHSA-2012:1306
- advisoryRHSA-2012:1307
- advisoryRHSA-2012:1308
Description
The asn1_d2i_read_bio function in crypto/asn1/a_d2i_fp.c in OpenSSL before 0.9.8v, 1.0.0 before 1.0.0i, and 1.0.1 before 1.0.1a does not properly interpret integer data, which allows remote attackers to conduct buffer overflow attacks, and cause a denial of service (memory corruption) or possibly have unspecified other impact, via crafted DER data, as demonstrated by an X.509 certificate or an RSA public key.
Affected Products
161 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| OpensslOpenssl | 0.9.1c, 0.9.2b, 0.9.3, 0.9.3a, 0.9.4, 0.9.5, 0.9.5a, 0.9.5a-beta1 | 0.9.8u |
| rootio-opensslrootio | See advisory | 1.0.1a-1 |
| openssl098eamazon | See advisory | 0.9.8e-17.8.amzn1 |
| openssl-develamazon | See advisory | 1.0.0i-1.41.amzn1 |
| openssl-perlamazon | See advisory | 1.0.0i-1.41.amzn1 |
Patched Releases
compat-openssl097g
0.9.7g-146.22.1
compat-openssl097g-32bit
0.9.7g-146.22.1
libopenssl-1_1-devel
1.1.1l-1.2
libopenssl-1_1-devel-32bit
1.1.1l-1.2
libopenssl-devel
0.9.8j-0.66.1, 1.0.2j-2.2
libopenssl-devel-32bit
1.0.2j-2.2
libopenssl0_9_8
0.9.8j-0.66.1
libopenssl0_9_8-32bit
0.9.8j-0.66.1
libopenssl0_9_8-hmac
0.9.8j-0.66.1
libopenssl0_9_8-hmac-32bit
0.9.8j-0.66.1
libopenssl1_0_0
1.0.2j-2.2
libopenssl1_0_0-32bit
1.0.2j-2.2
libopenssl1_0_0-hmac
1.0.2j-2.2
libopenssl1_0_0-hmac-32bit
1.0.2j-2.2
libopenssl1_0_0-steam
1.0.2h-4.1
libopenssl1_0_0-steam-32bit
1.0.2h-4.1
libopenssl1_1
1.1.1l-1.2
libopenssl1_1-32bit
1.1.1l-1.2
libopenssl1_1-hmac
1.1.1l-1.2
Openssl
0:0.9.7a-33.28, 0:0.9.7a-43.20.el4, 0:0.9.8e-7.el5_3.2, 0:1.0.0-4.el6_0.3, 0.9.8e-22.el5_8.3, 0.9.8j-0.66.1, 0.9.8o-4squeeze11, 1.0.0-20.el6_2.4, 1.0.0i-1.41.amzn1, 1.0.1a-1, 1.0.2j-2.2, 0.9.8u
openssl-1_1
1.1.1l-1.2
openssl-1_1-doc
1.1.1l-1.2
openssl-devel
0.9.8e-22.el5_8.3, 1.0.0-20.el6_2.4, 1.0.0i-1.41.amzn1
openssl-doc
0.9.8j-0.66.1, 1.0.2j-2.2
openssl-perl
0.9.8e-22.el5_8.3, 1.0.0-20.el6_2.4, 1.0.0i-1.41.amzn1
Timeline
Publicly disclosed
Apr 19, 2012
Last updated
Aug 4, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
- CWE-681 Incorrect Conversion between Numeric Types
References
- advisorysecurity-tracker.debian.org · CVE-2012-2110
- advisoryRHSA-2012:0518
- advisoryRHSA-2012:0522
- advisoryRHSA-2012:1306
- advisoryRHSA-2012:1307
FAQ
Common Questions.
The asn1_d2i_read_bio function in crypto/asn1/a_d2i_fp.c in OpenSSL before 0.9.8v, 1.0.0 before 1.0.0i, and 1.0.1 before 1.0.1a does not properly interpret integer data, which allows remote attackers to conduct buffer overflow attacks, and cause a denial of service (memory corruption) or possibly have unspecified othe…
Affected: Openssl versions 0.9.1c, 0.9.2b, 0.9.3, 0.9.3a, 0.9.4, 0.9.5, 0.9.5a, 0.9.5a-beta1; rootio-openssl; openssl098e (amazon), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including compat-openssl097g 0.9.7g-146.22.1, compat-openssl097g-32bit 0.9.7g-146.22.1, libopenssl-1_1-devel 1.1.1l-1.2.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2012-2110 On Your Attack Surface?
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