How severe is CVE-2017-3735?

CVE-2017-3735 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2017-3735 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-3735?

CVE-2017-3735 primarily affects Openssl. In total, 102 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-3735?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-3735 published?

CVE-2017-3735 was published on 2017-08-28 and last updated on 2026-06-17.

CVE-2017-3735

CVE-2017-3735 is a medium-severity vulnerability in Openssl with a CVSS 3.x base score of 5.3. Its EPSS exploit-prediction score of 18% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 18% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Openssl
Published: 2017-08-28
Last modified: 2026-06-17

Description

While parsing an IPAddressFamily extension in an X.509 certificate, it is possible to do a one-byte overread. This would result in an incorrect text display of the certificate. This bug has been present since 2006 and is present in all versions of OpenSSL before 1.0.2m and 1.1.0g.

Frequently asked questions

What is CVE-2017-3735?: While parsing an IPAddressFamily extension in an X.509 certificate, it is possible to do a one-byte overread. This would result in an incorrect text display of the certificate. This bug has been present since 2006 and is present in all versions of OpenSSL before 1.0.2m and 1.1.0g.
How severe is CVE-2017-3735?: CVE-2017-3735 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2017-3735 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-3735?: CVE-2017-3735 primarily affects Openssl. In total, 102 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-3735?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-3735 published?: CVE-2017-3735 was published on 2017-08-28 and last updated on 2026-06-17.

References

Affected products (102)

cpe:2.3:a:openssl:openssl:0.9.7j:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7k:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7l:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7m:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8a:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8b:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8c:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8d:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8e:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8f:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8g:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8h:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8i:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8j:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8k:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8l:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8m:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8m:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8n:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8o:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8p:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8q:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8r:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8s:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8t:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8u:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8v:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8w:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8x:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8y:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8z:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8za:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8zb:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8zc:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8ze:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8zg:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.0.0:beta2:*:*:*:*:*:*

More vulnerabilities in Openssl

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CVE-2021-3711 — Critical (CVSS 9.8): In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt().…
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All CVEs affecting Openssl →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

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CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

218.4.91.163 (ipv4-addr)
45.84.120.3 (ipv4-addr)
45.232.73.84 (ipv4-addr)
203.192.232.180 (ipv4-addr)
200.77.172.159 (ipv4-addr)
200.196.50.91 (ipv4-addr)
187.110.238.50 (ipv4-addr)
182.93.50.90 (ipv4-addr)